This Boston quartet sports two acoustic guitarists, a skilled percussionist, a cleanup multi-instrumentalist and soaring vocal harmonies. Their concise songs tend to take up residency in your head, thanks to melodies as catchy as commercial jingles and an unpredictable array of subjects that seem to traverse effortlessly from heady and heavy to lighthearted and humorous. Champions of the "street team" ethic, Guster have built up a large following by letting fans do much of their pro...  [+]