Google Chrome Music Lab is a free website from Google- duh- that allows you to let your musical creativity go crazy.
Here is the link: https://musiclab.chromeexperiments.com/Experiments
Here is an overview of Chrome Music Lab- https://www.youtube.com/watch?v=PdwmtU-FkrA
I'd like to suggest that you look at these videos for suggestions and ideas- and then just play with it. You'll learn faster that way.
Song maker is super fun and easy- https://www.youtube.com/watch?v=BqncqSxIwgc
This teacher shares tutorials that are good to follow- https://www.youtube.com/watch?v=AFEVjA7NM-o
if you create something you'd like to share please email it to me at [email protected] I'd love to see your work!!