Sweet Is The Melody - Iris Dement

Song Sung Blue - Neil Diamond
Music, Music, Music (DK when originally published, but made popular by Teresa Brewer in 1950.)
The Birth Of The Blues
Sing! Sing! Sing! (Duke Ellington?)
Sing ( popular song from the 1970s, IIRC)
Play A Simple Melody (duet of Play A Simple Melody and I Want To Listen To Rag) - Irving Berlin
That Old Time Rock And Roll
Do-re-mi -- (from The Sound Of Music)

Cielito Lindo ("Ay, ay, ay, canto y no llores, Porque cantando se alegran, Cielito Lindo, los corazones..." meaning "...sing and don't cry because, Beautiful Heaven, singing lifts the heart.")

Ich Bin Ein Musikaner (German folk song)
E, Cumpari (Italian folk song on the same theme -- i.e., musicians playing various instruments