Hey James, great question. For me, that number is really relative. It’s not set in stone. I begin to play the song, and then I’ll put on a metronome to match near the speed that I play it at. When I perform, I never actually use a metronome or BPMs, however, I know for practice, it’s useful for people to know the BPM, so you can practice the song away from the computer on your own with a metronome, so you know the speed to work up to.
If you go to google and type in metronome, there’s a really useful one that pops up. You can set the BPM’s and it gives you a click. That’s the one I use.
You never fail until you quit!