The idea on Tonin' was to turn the Manhattan Transfer loose on a baker's dozen of good old 1960s pop and R&B hits in league either with the original artists or prominent guests from that period and beyond. And yes, it's a stellar list, guaranteed to stir warm and fuzzy memories, and the tunes echo the old lament of an earlier age, "they don't write songs like they used to." For almost any other vocal group, this would be an entertaining coup, yet for the hugely gifted, compulsively adventurous Transfer