Zoot Suit Music!!
After I saw this film, I knew I needed to find the soundtrack for it. I searched everywhere (including this message board) for information. Before giving up I went back to the film to look at the credits. Under some of the song titles it says "Music and Spanish Lyrics by Lalo Guerrero." I entered the name into Wikipedia, and discovered that (while there is not an original soundtrack I can find) Lalo Guerrero reproduced many of the songs used in the film on a CD in the 90's!
So, if anyone out their it the world ever is dyeing to get their hands on some of the music from "Zoot Suit" hopefully this will save you some time. The name of Lalo Guerrero's CD is "Vamos A Bailar-Otra Vez! with Lalo Guerrero."