Ace's latest addition to its Songwriter Series, Listen People: The Graham Gouldman Songbook 1964-2005, appropriately enough begins with a track written by Gouldman, "That's How (It's Gonna Stay)." But the track is also significant in that it was performed by Gouldman, as well - as part of his early group The Mockingbirds. Throughout his career, he's worn many hats - as a songwriter, as a band member, as a solo artist - and all of them are touched upon on this fine celebration of a largely