As a roving elementary school music teacher in the cash-strapped Torrance Unified School District, Jack Sollecito has learned over the years how to make do with less - and less and less.Like a traveling troubadour, he often finds himself teaching kids how to sing and play in whatever space is available - the library, the cafeteria, empty classrooms, even storage rooms.As for equipment: not much more than an acoustic guitar and a handful of music stands, which often are shared by three or four students at a time.So when Sollecito - affectionately known as Mr. S - got to the Wood Elementary camp