SANTA MONICA, Calif., Dec. 29, 1999 -- With so many good composers and musicians around, it's hard to imagine the special, demented skills that produce bad soundtracks.Still, they do happen. As a public service, we've managed to identify the 1999 releases that don't seem to have much artistic integrity, much less redeeming value for discriminating ears. Our underachievers are:7. "More Music from Austin Powers" – OK, so maybe some of the stuff on this second soundtrack from the highly successful Mike Myers comedy is actually listenable. But we reject the need to create an entire CD just to present a dance mix of Madonna's "Beautiful Stranger."6. "Swing" – This soundtrack proves that Lisa Stansfield does not sing jazz well. While we're sure she's a very nice person, we suggest that Stansfield stick to her own style and leave the swing for those who can.5. "A