Sampling to create music was popularized by rap music producers and DJs in the 1980s. The practice, derived from a DJ's turntable techniques, takes pieces of pre-existing music and recombines them to create a completely new piece. Many musicians deride the practice as lacking creativity, while practitioners liken the process to a collage. Here is one way to loop and sample to create cool music.
You will need:
For an example of a great, simple sample loop track, listen to Sure Shot by the Beastie Boys. The song takes a cut from Jeremy Steig's Howlin' for Judy. There are only two instruments, flute and bass, each playing a melody.
Things to think about
Experiment with your sampling by adding layers of sound. Place a harmony on the third track, and some kind of atmospheric noise on the fourth track.
If you plan to use your sample loop in a song for publication, be aware of the copyrights of each track's original creators. In most cases, you'll have to obtain explicit permission for their use.