Every approximately 67-200 Ë (133 Ë average), the accenting of a songs beats will change from odd to even, even though it is running at a constant rate. Most well-known passages tend to accent odd.
Elapsed Beats uses the information of the song. BPM is a measure of speed. Time stands for itself. Elapsed Beats is a measure of distance.
There's math behind every scientific discovery.
Liquid & Dynamic
Similar to how we don't like when one theme or one idea describes everyone, why should we only use one form of display for songs? Elapsed Beats is a more specific song display that varies with each song, and says something different about each one. Every song has a similar time display but each has a different Elapsed Beats display.