Like most traumatic experiences from childhood, music lessons eventually become the stuff of nostalgia. Chances are, though, that if you still play the flute or the violin or whatever, your warm memories can't keep that instrument from languishing somewhere in the back of your closet. Maybe you just need a little inspiration — in which case it wouldn't hurt to stop by the Music Center of San Francisco. With sheet music for every instrument and every genre, a variety of instruments for rent (including flutes, clarinets, saxophones, oboes, trumpets, violins, violas, and cellos), and 15,000 titles that can be printed on demand, this place will give you very little reason to keep neglecting that oboe.