http://www.loopers-delight.com/

Looper’s Delight is a cultural and informational resource for musicians creating with audio loops of every sort. Loop based music essentially involves the repetition of audio samples, or loops. From that basic premise looping moves off in numerous directions, encompassing a wide range of techniques for building, manipulating, and using loops. The technique crosses many musical boundaries and appears in a wide range of musical styles and genres.