man findbpm (Commandes) - average keypresses over the length of a song to find the BPM
NAME
findbpm - average keypresses over the length of a song to find the BPM
SYNOPSIS
findbpm song.ogg
DESCRIPTION
This script plays a song file (in Ogg Vorbis or MP3 format) and lets you tap along on the spacebar, calculating the BPM (beats per minute) in the song as you go. It also gives you an offset in milliseconds of when you started tapping, compared to when the song started. You can then use these two values to create a step file for that song.
BUGS
This is only as accurate as your sense of rhythm. :)
AUTHORS
Brendan Becker <tgz@orotech.net> and Joe Wreschnig <piman@debian.org>.