If you are looking for a way to create music, you no longer need to master any instrument. All you need to know is how to use a computer and visit Soundation.
Soundation is a free to use website that provides sound loops and an interactive UI to play with those loops. You can overlap loops, modify their speeds, and do many other neat things to create wonderful new tracks. Although a signup is not required, it is better if you do register for an account. You sign up on the homepage of the site. When you first log in you are presented with numerous purchasable sound loop packs.