Looping in Musical Recording

Loops are usually a shorten section of up to four musical bars that you would repeat throughout a song. The looping in sequencing means something a little different than the way loop is used in conjunction with the musical recording term "Sampling". In all cases it means playing the same material over and over again. In sampling, you loop a portion of the waveform, so you can make a sound hold while a key is depressed. In "Production" you use a Loop as a pre-recorded snippet of sound that loops over and over, usually a specified amount time. Sequencer looping is closer to the latter and is actually related through MIDI  because you are repeating the information, not merely the same sound over and over.