Answer by taking a quote from the following article:

Bradley Joseph (born 1965) is an American composer, arranger, and producer of contemporary instrumental music. His compositions include works for orchestra, quartet, and solo piano, while his musical style ranges from "quietly pensive mood music to a rich orchestration of classical depth and breadth". Active since 1983, Joseph has performed in front of millions of people around the world. He played various instruments in rock bands throughout the Midwest until 1989 when Greek composer Yanni hired him for his core band after hearing a tape of his original compositions.

In 1989, Joseph recorded his first demo tape and sent it off to Greek composer Yanni, who was looking for someone to replace keyboardist John Tesh, as Tesh was launching his own solo career. When Yanni heard Joseph's compositions and arrangements, he was hired over the phone to join his core band, without ever meeting.  After moving to Los Angeles at age 23, he composed, arranged, and performed alongside Yanni for more than six years, performing in-concert with a number of notable symphony orchestras, touring throughout the U.S. and abroad as Yanni gained worldwide fame. His first show was at the Starplex in Dallas with the Dallas Symphony Orchestra filming a video project. "It was a real trial by fire for me", said Joseph. "First show + 10,000 people + TV cameras equals NERVOUS." He told Jane Fredericksen of the St. Croix Valley Press that "It was a big jump, you don't really realize it at the time, but there's no in-between -- going from playing nightclubs to arenas." Some of these early tours included the Reflections of Passion, Revolution in Sound, Dare to Dream, Yanni Live, The Symphony Concerts 1993 and 1994 concert tours, as well as a performance in Germany that was broadcast throughout Europe and seen by 30 to 40 million viewers. Joseph appears on the 1994 multi-platinum album and video, Live at the Acropolis. He recounts, "When I reflect back over the years, one of the high points that stand out include performing at the Acropolis with Yanni. Imagine all these different cultures coming together with the challenges of language, equipment, travel, and weather problems. I still picture the police running their dogs through the dressing rooms to sniff out any bomb possibilities right before the show. People still come up to me and comment how that show has affected their lives."  In the band, Joseph covered a lot of the keyboard parts that Yanni could not for lack of hands in the shows. He assisted with the task of managing the 30 or more synthesizers onstage, and helped layer with the orchestra to create a "full-bodied, live-effect sound". He did have to adjust some parts that did not work well in a live situation and worked extensively on programming sounds for all keyboardists. Joseph said that "Yanni gave us musicians a great deal of freedom to expand the music as well. If you listen to the original recordings he did and what we ended up with in our live recordings, you can really hear the musician's input." He readily credits Yanni's role in his professional development, and for five years of irreplaceable experiences and memories.  Between tours, Joseph worked extensively in recording studios on music ranging from rock and pop to rhythm and blues and orchestration with numerous artists from RCA, Epic, Warner Brothers, and Polygram Records, in addition to performing in an elaborate national keyboard show tour with various musicians. In 2003, he returned for the 60-city Ethnicity tour. CANNOTANSWER

How long did he work with Yanni?
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Svar genom att ta ett citat från följande artikel: Bradley Joseph (född 1965) är en amerikansk kompositör, arrangör och producent av samtida instrumentalmusik. Bland hans kompositioner märks verk för orkester, kvartett och solopiano, medan hans musikaliska stil sträcker sig från "tyst tankfull stämningsmusik till en rik orkestrering av klassiskt djup och bredd". Josef har varit aktiv sedan 1983 och har uppträtt inför miljontals människor runt om i världen. Han spelade olika instrument i rockband i hela Mellanvästern fram till 1989 då den grekiske kompositören Yanni anställde honom för sitt kärnband efter att ha hört ett band av hans originalkompositioner. 1989 spelade Joseph in sitt första demoband och skickade iväg det till den grekiske kompositören Yanni, som letade efter någon som skulle ersätta keyboardisten John Tesh, då Tesh höll på att lansera sin egen solokarriär. När Yanni hörde Josephs kompositioner och arrangemang anlitades han över telefon för att gå med i hans kärnband, utan att någonsin träffas. Efter att ha flyttat till Los Angeles vid 23 års ålder komponerade, arrangerade och uppträdde han vid sidan av Yanni i mer än sex år, framförande i koncert med ett antal noterbara symfoniorkestrar, turnerade i hela USA och utomlands i takt med att Yanni vann världsrykte. Hans första show var på Starplex i Dallas med Dallas Symphony Orchestra som filmade ett videoprojekt. "Det var en verklig eldprov för mig", sade Josef. "Första showen + 10 000 personer + TV-kameror är lika med NERVOUS." Han berättade för Jane Fredericksen på St Croix Valley Press att "Det var ett stort hopp, man inser det egentligen inte på den tiden, men det finns ingen mellan -- att gå från att spela nattklubbar till arenor." Några av dessa tidiga turnéer inkluderade Reflections of Passion, Revolution in Sound, Dare to Dream, Yanni Live, The Symphony Concerts 1993 och 1994 konsertturnéer, samt ett framträdande i Tyskland som sändes över hela Europa och sågs av 30 till 40 miljoner tittare. Joseph förekommer på 1994 års multiplatinumalbum och video, Live at the Akropolis. Han berättar, "När jag reflekterar tillbaka genom åren, en av de höjdpunkter som sticker ut inkluderar att uppträda på Akropolis med Yanni. Föreställ dig alla dessa olika kulturer som kommer tillsammans med utmaningarna i språk, utrustning, resor och väderproblem. Jag ser fortfarande polisen köra sina hundar genom omklädningsrummen för att sniffa ut eventuella bombmöjligheter precis innan showen. Folk kommer fortfarande fram till mig och kommenterar hur den showen har påverkat deras liv." I bandet täckte Joseph en hel del av klaviaturdelarna som Yanni inte kunde på grund av brist på händer i showerna. Han assisterade med uppgiften att hantera de 30 eller fler synthesizers på scenen, och hjälpte lager med orkestern att skapa ett "fylligt, live-effekt-ljud". Han var tvungen att justera vissa delar som inte fungerade bra i en livesituation och arbetade flitigt med att programmera ljud för alla keyboardister. Joseph sade att "Yanni gav oss musiker en hel del frihet att utöka musiken också. Om man lyssnar på originalinspelningarna han gjorde och vad vi hamnade med i våra liveinspelningar kan man verkligen höra musikerns input." Han krediterar villigt Yannis roll i sin professionella utveckling, och för fem år av oersättliga erfarenheter och minnen. Mellan turnéerna arbetade Joseph flitigt i inspelningsstudior på musik från rock och pop till rytm och blues och orkestrering med ett flertal artister från RCA, Epic, Warner Brothers och Polygram Records, förutom att uppträda i en genomarbetad nationell keyboardshowturné med olika musiker. 2003 återvände han för 60-stadens Etnicity-turné. Hur länge jobbade han med Yanni?
Answer by taking a quote from the following article: Bradley Joseph (born 1965) is an American composer, arranger, and producer of contemporary instrumental music. His compositions include works for orchestra, quartet and solo piano, while his musical style ranges from "quietly thoughtful atmospheric music to a rich orchestration of classical depth and breadth". Joseph has been active since 1983 and has performed in front of millions of people around the world. He played various instruments in rock bands throughout the Midwest until 1989 when Greek composer Yanni hired him for his core band after hearing a band of his original compositions. In 1989, Joseph recorded his first demo band and sent it off to Greek composer Yanni, who was looking for someone to replace keyboardist John Tesh, as Tesh was launching his own solo career. When Yanni heard Joseph's compositions and arrangements, he was hired over the phone to join his core band, without ever meeting. After moving to Los Angeles at the age of 23, he composed, arranged and performed alongside Yanni for more than six years, performing in concert with a number of notable symphony orchestras, touring throughout the United States and abroad as Yanni won world fame. His first show was at Starplex in Dallas with the Dallas Symphony Orchestra filming a video project. "It was a real test of fire for me," Joseph said. "First show + 10,000 people + TV cameras equals NERVOUS". He told Jane Fredericksen of St. Croix Valley Press that "It was a big jump, you don't really realize it at the time, but there's no one between -- going from playing nightclubs to venues." Some of these early tours included Reflections of Passion, Revolution in Sound, Dare to Dream, Yanni Live, The Symphony Concerts in 1993 and 1994 concert tours, as well as an appearance in Germany broadcast across Europe and seen by 30 to 40 million viewers. Joseph appears on the 1994 multiple-tinum album and video, Live at the Acropolis. He tells me, "When I reflect back over the years, one of the highlights that stand out includes performing at the Acropolis with Yanni. Imagine all these different cultures that come along with the challenges of language, equipment, travel and weather problems. I still see police driving their dogs through the locker rooms to sniff out any bomb opportunities right before the show. People still come up to me and comment on how that show has affected their lives." In the band, Joseph covered a lot of the keyboard parts that Yanni could not due to lack of hands in the shows. He assisted with the task of dealing with the 30 or more synthesizers on stage, and helped warehouses with the orchestra create a "bodied, live-effect sound". He had to adjust some parts that did not work well in a live situation and worked extensively programming audio for all keyboardists. Joseph said that "Yanni gave us musicians a lot of freedom to expand the music as well. If you listen to the original recordings he made and what we ended up with in our live recordings, you can really hear the musician's input." He willingly credits Yanni's role in his professional development, and for five years of irreplaceable experiences and memories. Between the tours, Joseph worked extensively in recording studios on music from rock and pop to rhythm and blues and orchestration with numerous artists from RCA, Epic, Warner Brothers and Polygram Records, in addition to performing in an elaborate national keyboard show tour with various musicians. In 2003, he returned for the 60-city Ethnicity tour. How long did he work with Yanni?
CANNOTANSWER
CANNOTANSWER