Creedence or no Creedence, Berkeley is an incestuous, self-righteous town blessed with an unparalleled concentration of mostly self-righteous talent. The far-from-adolescent protagonists of Joy of Cooking, with their roots in everything but rock and roll, could be predicted to turn out music that makes up in art, as they say, what it lacks in vitality, fun, and the common touch. Their album, however, is already moving up the trade charts, and when there's a tour, it can be expected to break big. If it's hard to imagine the band exciting young teen-agers, it's not because the music is sterile but because Joy of Cooking is a very adult rock band. It's adult, however, in the youthful way we try to be adult--without abandoning freshness and spontaneity--and so young teen-agers, who are not as predictable as older teen-agers like to think, can also dig it. After all, it has vitality, fun, and the common touch.