(There's no video for G-Force 2.0 yet. Please contribute to MR and add a video now!)
G-Force is a sound visualizer for PowerPC Macs. It was intended for use with SoundJam but it can also be used a stand-alone app if you move the "G-Force Files" folder to the same folder as the app.
See also: White Cap 4.0
G-Force2.0.sit_.bin (1.63 MiB / 1.71 MB)
G-Force v2.0 / Binary encoded, use Stuffit Expander
Mac OS 8.x - Mac OS 9.2.2 and Mac OS X
Emulating this? It should run fine under: SheepShaver