“When Osvaldo Golijov’s opera ”Ainadamar” premiered at Tanglewood in 2003, it met with general acclaim, though not the kind of instantaneous and unified praise other projects of his had engendered. The music was often beautiful, but to some listeners, there seemed a lack of dramatic tension, and some critics saw a misfit between the play and the score. Something just seemed off-kilter. One of the dissatisfied, it turns out, was the composer himself… With the help of director Peter Sellars, he and librettist David Henry Hwang undertook a substantial revision.”