[WORLD PARTY] Well, you don't say: A rock band mixing pop melodies with worldly rhythms and West African guitars? How au courant! While the novelty of that particular formula wore off the moment Vampire Weekend went to No. 1, Brainstorm manages to keep things interesting on its second album, cutting its tropical hodgepodge with a streak of subtle experimentalism. Baritone blurts of tuba underscore well-studied Tuareg guitar patterns; pulsing dance grooves stutter around and underneath the double-helixing vocals of drummer-keyboardist Adam Baz and guitarist Patrick Phillips. It's an addictive listen, helped out by parasitic hooks, which infect everything from the shimmying opener "Flat Earth" to the minor-key, practically metallic "Lonely Ghost."