These are just some links of interest for loop-enthusiests.

• "Music Loop" on Wikipedia
• LoopersDelight.com - One of the best sites on the web for looping info.
• "Make a Repeating Audio Loop in Audacity" - on Jake Ludington's MediaBlab site.
• "What is an audio loop?" - on PureSoundDirect.com

Also see..

• Lexicon JamMan
• Who Loops?