There are far too few venues for violinists, pianists and cellists to perform in public, outside of massive symphony orchestras. This creates quite the dilemma for amateur musicians who want to perform chamber music, or who simply prefer playing in a more intimate and less formal atmosphere. There's always the option to busk, of course, but that requires a thicker skin and a completely different wardrobe. Luckily, on the second Monday of each month the Tavern of Fine Arts (313 Belt Avenue; 314-367-7549 or www.tavern-of-fine-arts.com) hosts its Classical Music Open Stage: the beautiful and peculiar offspring of open-mic nights and classical concerts. Open Stage allows anyone with an instrument and an inclination to take the stage and metaphorical mic and play anything they'd like -- whether a famous baroque overture, a contemporary pop song or their own composition. Admission is free, and all ages and skills levels are welcome.