Used music: Planet Records
Location: 144 Mt. Auburn St., Cambridge
Hours: Mon.—Thurs. 11 a.m. to 8 p.m.; Fri.—Sat. 10 a.m. to 9 p.m.; Sun. noon to 7 p.m.
Phone number: 617-492-0693
Planet Records sells T-shirts that riff on the movie "High Fidelity," which is set in a record store full of music snobs. But unlike their big-screen counterparts, the sales associates at Planet are willing to help customers.