The ABC song using the manual alphabet song.
Fingerplay songs for non-verbal kids
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Find a recording or print copy of some songs from "Greg and Steve." "The World is a Rainbow," Days of the Week, Months of the Year, (these are also sung in Spanish on the recordings)

Mi Chacra (My Farm) in English, Spanish and sign. I teach my Adaptive Music classes in three languages. That impresses my "regular ed" kids no end.

Add-on songs--"The Tree in the Woods" and so forth

Don't forget "Hokey Pokey" and other movement songs.

These are all so easy that I play them by ear, but there are tons of books available with such things in them. I do recommend the Greg and Steve songs, though.

Anything that you like to play and sing, your kids will, too.