This unusual program of Off Broadway songs, a collection of small marvels, makes public a backstage secret that has been shared enthusiastically by Jerry Orbach’s fellow minstrels in "The Threepenny Opera," "The Fantasticks," and, most recently, "Carnival." During rehearsal breaks, while waiting in the wings, or while toweling off make-up, they have heard through thin partitions a side of Jerry Orbach as a singer that has until now flourished well out of public hearing. What they have heard might be described as Orbach, the casual come-one come-all troubadour. It is a matter of public record, and critical accord, that Jerry has one of the finest voices now to be heard in theatre music. The quondam secret is simply that his ability as a singer ranges far beyond the limited musical conventions of the footlights. He can sing almost any kind of song with warmth, wit, and the kind of embracing musical intelligence that makes the singer the servant of the song. His superlative vocal technique is a prism that refracts the broad spectrum of tenderness and satire, love and humor, bravado and wistfulness that inheres in the present cachet of songs which with one exception) first flowered in the hardy creative reaches of lyric theatre that lie beyond the house of mirrors where Broadway seeks its own reassuring image every turn.