Tunes here are cut into one time or two time pass(s) and are meant to be used for learning purposes. Tunes are provided in .wav format as .mp3 creates lead and trailing tails on the loops such that they do not repeat properly. They are best used with a sound editing program of which there are many to choose from, both free and pay for.
When using Audacity you must hold down the shift key then click the green arrow for loop-play.