Used musical instruments: Mr. Music
Location: 128 Harvard Ave., Allston
Hours: Mon.-Fri. 10 a.m. to 7 p.m.; Sat. 10 a.m. to 6 p.m.; Sun. noon to 5 p.m.
Phone Number: 617-783-1609

This Allston mainstay sells new and used electric and acoustic guitars, basses, accordions, guitar pedals, and amplifiers.