Cthugha (pronounced 'Kah-Thoo-Gah') is a free programwhich takes sound input from a CD, stereo, or microphone and displays colorful animated graphics synced to the sound. Sort of like an oscilloscope, but wilder. Cthugha has become a very popular form of visual entertainment, useful for parties, concerts, raves, and other events as well as just vegging out tomesmerizing, hynotizing displays.