free music download??

Hey ladies, so along with a lot of things I'm getting my fiancée for Christmas, I want to make him a CD with his fav music because his car doesn't connect to Bluetooth and he can't even use a audio cord to listen to his music while driving. He only has a cd slit so I figured I could make him a cd with all the songs he listens to. I went on his YouTube and wrote down all the songs he listens to all the time.  Do any of you know any websites or apps I can use to download the music for free so I can burn it onto a cd?? I can't seem to find anything.