Technical stuff, for those interested: This arrangement was assembled in Logic. The guitars are two instances of the AAS Strum GS-2, run through NI’s Guitar Rig; the bass is the String Studio VS-2; and, the percussion is Logic’s Ultrabeat.
(Want to make music on your own computer? If you have a Windows machine, you can download Cakewalk for free. Add a cheap MIDI keyboard (preferably velocity-sensitive, with pitchbend and modulation wheels) and download a few freebie VST soft synths (u-he has a generous selection, including Zebralette, Tyrell N6 and Triple Cheese), and you will have more more synth power at your fingertips than Keith Emerson could dream of during his glory days, for peanuts.)