In this musical puzzle, there's a looped riff with an unusual time signature -- or number of beats per bar. The riff is on track 1 in the Composer tool below.
You can either count out the beats in each bar or use the musical counters on track 3 to help you. The first counter has 1 beat, the second has 2, and so on up to 5.
The answer is 9 beats per bar, or 9/4 in musical terminology. The music in this puzzle is from Dennis Rollins' SoundJunction remix, Promise Land.