POWER OF PEACESupergroup pairings rarely work. Either there are too many egos involved or the magic promised on paper doesn't materialize because there are too many cooks in the kitchen, or record label and managerial bluster get in the way of actual spontaneity. That's not the case with Power of Peace, delivered by the Santana and Isley families in a Las Vegas studio without prior rehearsal. The material on this 13 song set is comprised mostly of iconic soul,