The progenies of "Hair" have not enjoyed a great track record. It is therefore all the more pleasant to report that the latest of that tribe, "Rainbow,"… is a distinct success. It has the style, manner and energy of "Hair," as well as its chaotic organization and its simplistic view of a far from simple world….

The musical is joyous and life-assertive. It is the first musical to derive from "Hair" that really seems to have the confidence of a new creation about it, largely derived from James Rado's sweet and fresh music and lyrics.

"Rainbow" almost literally takes off from where "Hair" ended. At the end of "Hair," Claude, the drafted dropout, is killed in Vietnam. In "Rainbow," someone called simply Man has been killed in Vietnam, and comes over the other side into Rainbow land….

The whole thing is great fun until for one horrid and...