I wanted to figure out the tempo of a song I like, and instead of googling it like a normal person I made this so I can just do it myself lol. Get a song playing where you can hear it (in another tab or on another device or something) then go back to this project. After clicking the flag, click the dark purple button in the corner to start a 60 second timer. Then hit space or click anywhere, on the beat, and it will count the number of beats that happen. Once the timer stops (you will hear a ding), whatever number the beat counter is on should be the correct BPM of the song, as long as there weren't any tempo changes (and you have good timing lol). For the most accuracy, click the start button on the beat of the music. Try it a few times on the same song to make sure your results are consistent. You can test if you have good timing by trying this with a more well known song, then looking up its BPM and comparing that with your results from this project. You can also try the metronome, although that doesn't work super well. First run the beat counter with your chosen song, then with the song still playing, click the metronome button once to prime it. Click it again one time on the beat of the music, and it will tick at the set speed for 30 seconds. I've had trouble making the metronome work right, but maybe I'm just struggling with timing today lol-