How to make two soundtracks play at the same tempo?

I need help trying to make two soundtracks play at the same tempo. Both soundtracks are music, so it shouldn’t be that hard. Can someone please tell me how?

Effect Change Speed will change tempo & pitch together. If it’s a small change or you don’t mind changing pitch, this is basically foolproof… It’s just like speeding-up or slowing-down a record or tape.

Effect Change Tempo will change tempo without changing the pitch. The processing for this is more complex, and sometimes you can get artifacts (side effects).

You’ll need to count the beats for 30 seconds or 1 minute on both songs to find the current tempo, and then calculate the difference or change. It’s usually easier if you count 1-2-3-4, 2-2-3-4, 3-2-3-4, etc.