In home recording or DJ sessions, loops (drums, synthe, bass, etc.) are often used. The tempo in BPM is also often provided when buying such audio data. For the contest, we used a collection of loops described below.
These loops are courtesy of the Tape Gallery, partner of the MTG in the AudioClas project). They are not distributed here for copyright reasons, however, a complete list of loops is here (format is 'loopID'-tab-'tempo'-tab-'loopName'). From the webpage of the Tape Gallery, it is possible to search for, listen to and buy these loops.

Tempo annotations for this data set are available