Susan Jackson has one of those high-beam smiles that could blind you if it didn't make you feel so good inside. That's part of her power as a music teacher. There's also something about her tiny attic studio that makes you feel really, well, arty. It's filled with instruments, because Jackson doesn't teach just the wonderfully antiquated accordion; she will also help you and yours master the piano, guitar, violin and pretty much anything else with a string to pluck or a key to press. For a half-hour you'll get her undivided attention, always upbeat and positive. And even if you're not as fabulously talented as you wish you were, you'll leave class feeling like a true musician. And if you need some extra inspiration, you can catch her at one of her gigs around town, where she plays and sings like a fabulous she-devil with Beans Barton and the Bipeds.