Even if you ignore the beeping noise a PC makes when you boot it up (and who can blame you for wanting to?), the computer still has three ways of generating sound. One is to play CD audio--either by putting, say, a Dire Straits disc into your CD-ROM drive or by using a CD-ROM title like 7th Level's Tuneland that makes use of CD audio tracks. The second method is waveform sound, which is a digital recording of any kind of sound or music (for example, Windows' warning-sound file ding.wav). The third is MIDI--a kind of digital sheet music that instructs synthesizer chips on the notes, tempo, and instrumentation of a musical passage.