Yair Rosenblum

Yair Rosenblum (; January 6, 1944 – August 27, 1996) was an Israeli composer and arranger.
Music career.
Rosenblum was born in Tel Aviv. He was musical director of the Israel Defense Forces chorus in the 1960s and 1970s. He directed Israel's annual music festivals.
He conducted and composed songs for the Israel Defense Forces army and navy ensembles. He is best known for such songs, including "Shir LaShalom" (1970). He composed songs for films and television, and worked with a number of bands and choral groups. He wrote more than 1,000 songs, including "Ammunition Hill" (1967), "In a Red Dress," "The Beautiful Life," "Tranquility," "Hallelujah," and "With What Will I Bless Him."
Death.

Helitron

Helitron is a mixed choir operating in Tallinn and originally set up to cater to employees of Tondi Elektroonika. Of the employment-related choirs established during Soviet occupation of Estonia, Helitron was one of the most famous ones, and is one of the few ones who have outlived the USSR.
A number of people who participated in the Singing Revolution in musical rôles have at some point in their life been involved with Helitron, as either a singer in it, or as a conductor or arranger.
Repertory.
The choir has been singing baroque and religious music and is also known for its chamber music performances. Before the dissolution of Soviet Union, it also performed Soviet music.
On 1 May 1975, Helitron was the first choir to perform Mõistatused (Estonian for "Puzzles"), an orchestral piece based on Estonian folk songs by Ester Mägi. This performance was conducted by .
Conductors.
In 1964, Harald-Peter Siiak became the chief conductor of Helitron.
In 1998–2004, the chief conductor of Helitron was Veronika Portsmuth.