iTunes is essential for buying music. Artists profit the most when you physically buy their content. Digital Sales are also important.
Buying Music on iTunes is relatively easy for the most part.
1. First Search for the track you're looking for. 
2. After finding the track Click the $1.29 and buy the song
3. Make sure to have a buying method. You can buy all copies, clean or 🅴 for whichever track you desire.
4. After buying the track once there is an option to buy each track again. Start by clicking the song again. Here an example:
5. After you've bought the song make sure to head on over to Apple Music and delete the entire download. This will remove it from iTunes Data base and add it to Apple Music so it counts toward Apple Music 200. After deleting re-add it back by just clicking the + once. Watch how below: