Unity on the Bay's music ministry says its mission is to "heal, enlighten, and minister through music in order to inspire and transform our world." A very pious aim to be sure, but don't expect Gregorian chants with a hymn or two thrown in on holidays. Unity's choir members tithe ten hours a week to make Sunday church-going a joyous musical experience. That means gospel, but it also means R&B, hip-hop, and jazz — everything from Destiny's Child to U2 to Andrea Bocelli. The choir's repertoire is as diverse as the congregation it sings to, and hallelujahs come as easily as hellos.