you can't tap a "beat" only a steady pulse – TapTheBeat Free Review

If you're a drummer and you want to tap a literal beat and find out the exact BPM, you're out of luck with this app. It keeps changing it's interpretation of the BPM based on the time between each tap. So if you tap a complex beat, it won't give you an accurate BPM because it gets confused by the beats in between the main pulse. So the only way to translate a true beat into BPM is to first distill it into a straight pulse on your own and tap that.
Review by calzones on TapTheBeat Free.