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Session musicians, studio musicians, or backing musicians are musicians hired to perform in recording sessions or live performances. Session musicians are usually not permanent members of a musical ensemble or band. They work behind the scenes and rarely achieve individual fame in their own right as soloists or bandleaders. However, top session musicians are well known within the music industry, and some have become publicly recognized.
Hal Blaine was born Harold Simon Belsky to Jewish Eastern European immigrants, Meyer and Rose Belsky (nee Silverman[2]), in Holyoke, Massachusetts. Blaine was a prolific session player and by his estimation played on over 35,000 recordings, including 6,000 singles. He is widely regarded as one of the most in-demand drummers in rock and roll history, having "certainly played on more hit records than any drummer in the rock era"
https://en.wikipedia.org/wiki/Hal_Blaine
Hal Blaine was born Harold Simon Belsky to Jewish Eastern European immigrants, Meyer and Rose Belsky (nee Silverman[2]), in Holyoke, Massachusetts. Blaine was a prolific session player and by his estimation played on over 35,000 recordings, including 6,000 singles. He is widely regarded as one of the most in-demand drummers in rock and roll history, having "certainly played on more hit records than any drummer in the rock era"
https://en.wikipedia.org/wiki/Hal_Blaine