Are you a music tinkerer, doodler? Inudge is a music tool that will allow you to add notes, play to hear what it sounds like, make modifications, and keep listening. (note, it may take a couple minutes to load).
Click squares and listen to changes in your tune. Deselect squares if you don't want them anymore. Choose different Sound Patterns and create your own mix of musical tones to make and share.
What do different geometric shapes sound like? For instance a square, rectangle, triangle?
Yes it is addicting, so be careful.