Which Frank Sinatra song was the first music played on the lunar surface, chosen by Buzz Aldrin on a cassette player?

Fly Me to the Moon

A cassette containing Sinatra’s “Fly Me to the Moon” traveled with Buzz Aldrin on Apollo 11, helping cement the recording’s association with the Moon landing. However, whether Aldrin actually played it after landing—and whether it was the first music heard on the lunar surface—remains disputed; Aldrin later said he did not remember doing so.