So much much copyrighted that it is hard at times to find the songs and pieces that you want to learn to play. There is an excellent site called Musescore that you can join for free and find hundreds of pieces to play. If you want to have even wider access, you can pay a cheap membership fee that will allow you to download thousands of scores.
Musescore alo offers carious online music courses ranging from music composition to learning specific instruments to working in a recording studio. You can access the courses any time that suits you best and start learning!