I'm trying to find a way to measure the speed of a song from the perspective of singing/rapping. So far all I can find is BPM (beats per minute), however there are at least 2 issues with that:
- The BPM number depends on which beats are counted, quite often a website will report twice the BPM that I measure by myself.
- The BPM is not always related to the vocal speed. For example, "Thoughts Of A Dying Atheist" by Muse has 179 BPM but the singing part is quite slow, while "Break Ya Neck" by Busta Rhymes has only 83 BPM, but a... neck-breaking rapping speed.
Is there a more accurate measurement for the vocal speed? I'm thinking something along the lines of (continuous) syllables per minute, excluding the instrumental parts.