how many keys on a concert grand piano
Piano Most modern pianos have a row of 88 black and white keys, 52 white keys for the notes of the C major scale (C, D, E, F, G, A and B) and 36 shorter black keys, which are raised above the white keys, and set further back on the keyboard. This means that the piano can play 88 different pitches (or "notes"), going from the deepest bass range to the highest treble. The black keys are for the "accidentals" (F♯/G♭, G♯/A♭, A♯/B♭, C♯/D♭, and D♯/E♭), which are needed to play in all twelve keys. More rarely, some pianos have additional keys (which require additional strings). Most notes have three strings, except for the bass that graduates from one to two. The strings are sounded when keys are pressed or struck, and silenced by dampers when the hands are lifted from the keyboard. Although an acoustic piano has strings, it is usually classified as a percussion instrument rather than as a stringed instrument, because the strings are struck rather than plucked (as with a harpsichord or spinet); in the Hornbostel–Sachs system of instrument classification, pianos are considered chordophones. There are two main types of piano: the grand piano and the upright piano. The grand piano is used for Classical solos, chamber music, and art song, and it is often used in jazz and pop concerts. The upright piano, which is more compact, is the most popular type, as it is a better size for use in private homes for domestic music-making and practice.
Music recording sales certification At the industry level, in 1958 the Recording Industry Association of America introduced its gold record award program for records of any kind, albums or singles, which achieved one million dollars in retail sales. These sales were restricted to U.S.-based record companies and did not include exports to other countries.[3][4] For albums in 1968, this would mean shipping approximately 250,000 units; for singles the number would be higher due to their lower retail price.[4] The platinum certification was introduced in 1976 for the sale of one million units, album or single, with the gold certification redefined to mean sales of 500,000 units, album or single. No album was certified platinum prior to this year. For instance, the recording by Van Cliburn of the Tchaikovsky Piano Concerto from 1958 would eventually be awarded a platinum citation, but this would not happen until two decades after its release. In 1999, the diamond certification was introduced for sales of ten million units.