Sandra Boynton's Rhinoceros Tap is a loopy good time--delicate piano ballads swoon over unloved peas all alone on a plate ("O Lonely Peas") and the pink-nosed object of a lovesick mouse's affection ("I Love You More Than Cheese"); a penful of pigs dig into a doo-wop celebration of their "fabulous swine" selves ("Perfect Piggies"); and a Dylan-esque dog bids his pack adieu with the mournful line, "It's sad but true/I'm 6 years old, but I feel 42" ("So Long, Doggies"). Best of all, skeptics who guessed that Boynton's first CD, the star-studded wacko revue "Philadelphia Chickens," succeeded so brilliantly because she had an army of celebrities behind her are dutybound to shush. There is but one singer here, the pleasantly even-keeled Adam Bryant, and though he lends these 15 numbers a likability that may not have translated without him, it is Boynton's crackpot wit, as well as the winning arrangements she pieced together with musical partner Michael Ford, that de! serves full credit for the way the songs winnow themselves into listeners' brains, be they 3 or 34. --Tammy La Gorce