The singer/guitarist passed away on Saturday (16Feb13) in Hamburg, Germany. He was 72.
Sheridan is best known for singing on some of the Fab Four's earliest recordings after meeting a young John Lennon, Paul MCCartney, George Harrison and original drummer Pete Best in the early 1960s in Germany.
The Beatles served as his back-up band in the Hamburg club scene, and they joined forces to record tracks including My Bonnie, The Saints and Ain't She Sweet.
Posting a statement on his official website, MCCartney writes, "Tony was a good guy who we knew and worked with from the early days in Hamburg. We regularly watched his late night performances and admired his style. He will be missed."