A guitar instrumental music was played with 4/4 timing and tempo of 86 bpm settings. One pattern consist of 6 notes ( or beats). On audacity, a unit strumming pattern ( = 1 bar) takes roughly 2.78sec. How do I derive the bpm theoretically from this pattern length correctly? Or in other words how do I get a figure close to 86bpm from this unit pattern length of 2.78 (approx) sec?
It's given that one measure lasts 2.78 seconds.
Since one measure lasts 2.78 seconds, there can be 60/2.78 measures per minute.
It's also given there are four beats per measure. Since there are four beats per measure, the tempo is (60 / 2.78) * 4 bpm.
Therefore, the tempo is approximately 86.33 bpm.