I am not completely certain what you are asking us for, but the others have given answers that address what I would consider to be your intent.
If you didn’t get what you were looking for, try to clarify your question a bit. I am sure everyone responding would like to assist you as much as possible. But don’t forget that your teachers seem to be trying to get you to use your resourcefulness to find answers, so don’t take the easy way entirely. Put in a solid effort on finding more information on your own.
Kick into Google “Music and heart rate” & a bunch of journal articles will appear – I just did it. Some may just be abstracts, but at least you’ll have the citation in order to get the full paper. Look for the most recent “review” paper & start from there. Good luck with the project!