We fell in love with St. Vincent—the artist moniker for singer-songwriter and multi-instrumentalist Annie Clark—when she released “Cruel” on her third album, Strange Mercy. http://www.youtube.com/watch?v=Itt0rALeHE8&feature=kp   We still can't get enough of that track, as it resonates in our minds with its dreamlike melodies, driving beat, and feverish, jagged guitars. But don't sleep on