BOBBY McFERRIN The vocal acrobat pours his joy into songs  of faith and devotion  “Making music is the most joyful experience I know,” says vocalist and conductor Bobby McFerrin, best known for his 1988 Grammy-winning smash, “Don’t Worry, Be Happy.” His new album, spirityouall, is a collection of devotional songs and original compositions. “Without faith I couldn’t walk, much less sing,” says McFerrin. “My career is very public,...