You can't go wrong with Johnny Mercer and his collaborations.

Cole Porter, George Gershwin, Johnny Mandel, Rodgers (Hammerstein and Hart),
Duke Ellington (Billy Strayhorn), Irving Berlin, Hoagy Carmicheal (are the old standbys)

Some Beatles. (Not all, please) "Imagine" always works well.

On the Mercer special on the Movie channel they played a lovely version of "Dream".