I know there are tons of them, but these are my favs. Share yours 
That's Not My Coin (Crypto and Bitcoin edition)
https://www.youtube.com/watch?v=MAcFrToY0Uw
CryptoBro First Date Gone Wrong (Bitcoin Song)
https://www.youtube.com/watch?v=maQkL5qHEnc
Chris Record - HODL GANG - Bitcoin Rap Gucci Gang Remix Parody
https://www.youtube.com/watch?v=JZYZoQQ6LJQ
All About That Bitcoin - by Naomi van der Velde
https://www.youtube.com/watch?v=XEBWtbhq0Ts
That's Not My Coin (Crypto and Bitcoin edition)
https://www.youtube.com/watch?v=MAcFrToY0Uw
CryptoBro First Date Gone Wrong (Bitcoin Song)
https://www.youtube.com/watch?v=maQkL5qHEnc
Chris Record - HODL GANG - Bitcoin Rap Gucci Gang Remix Parody
https://www.youtube.com/watch?v=JZYZoQQ6LJQ
All About That Bitcoin - by Naomi van der Velde
https://www.youtube.com/watch?v=XEBWtbhq0Ts
Well, it is really good for relaxing. Its melody is fun and easy to remember. I think this is also one of interesting way to combine relaxing and learning. Thanks for your sharing and hope there will have more products like this