Ready to head back to the dawning of the Age of Aquarius? Hair, from composer Galt MacDermot and librettist-lyricists Gerome Ragni and James Rado, made quite a splash Off-Broadway in 1967, but when it moved uptown under the avant garde direction of Tom O'Horgan, it was an immediate, shocking sensation. The original Broadway production of "the American tribal love rock musical" would ultimately run for 1,750 performances and inspire three Broadway returns, but the reach of the pro-peace,