"All God's children got rhythm," went a popular standard performed by Judy Garland, Stan Getz, and many others. In the case of the East L.A. group called God's Children, that lyric certainly was true. Music is the Answer: The Complete Collection is the name of their first-ever long-playing release, available tomorrow from Minky Records on CD and this Saturday on limited edition brown vinyl for Record Store Day. This holy grail of Latino soul and Chicano rock presents their released sides plus