Whoever dreamed up the collaboration between African vocal ensemble Ladysmith Black Mambazo and the English Chamber Orchestra deserves a Grammy. As arranged by Ralf Gothoni on the album “No Boundaries” (Heads Up), this Zulu-goes-classical themed outing proves a delicately haunting, richly rewarding affair. Repertoire includes an orchestrated reading of Paul Simon's “Homeless,” a stunning “Amazing Grace” and an Africanized version of Bach's “Jesu, Joy of Man's Desiring.” A

Another South African vocal group, the spiritually inclined Soweto Gospel Choir, makes its pleasant American debut with “Voices From Heaven”(Shanachie). B