Been trying to search through the Internet. I can’t quite seem to find anything in regards to how to get the tempo/speed of a song, does anyone know any built in function or even a library?
Edit: I tried to use the Minim library and used getTempo() but that seems to fail.
Did you look at beat detector or what the name is?
WHat library is that under?
Minim too
Chrisir
Have a nice day!
Oh, how would I implement this if you happen to have an idea as I am really struggling to do it.
You too mate 
I have no idea
Good luck!
Did you see
http://code.compartmental.net/minim/beatdetect_class_beatdetect.html
Just measure something between beats
Very interesting I will take a look at it 
Measure the time like with command millis()
See reference