CD Scratch is a FREE, funky and incredibly fun "Virtual Turntables CD Player" performing the seemingly impossible... Play two songs from the same CD at the same time - one forwards and one in reverse! (No spyware, no banner ads).
With this freeware application you can generate ultra pure Solfeggio frequencies using any Windows PC. The application also allows you to generate any other custom frequency and the ability to play a Fibonacci sequence of any or all tones.