This is pretty cool. How far do you intend to take it? Here's a "use case"/feature request:<p>In addition to being a developer/entrepreneur, I moonlight as a high school marching band instructor/arranger. In other words, I'm a semi-professional composer. I work with a team of people who write different aspects of the music: One guy writes the winds, I write the percussion, and others contribute as well.<p>Currently, whenever one of us has an idea about something to do with whatever we're arranging, we have to either get everyone together in a room with a piano to talk through it, or someone has to sit down with a professional music notation program (we use Finale) and "sketch" it all out.<p>It would be really cool if there was something online like RiffUp that would let me put together that "sketch" quickly and easily, and send a link to my colleagues. Like a "pastebin" for sheet music.<p>To get there, it would need to do a few more things, in roughly priority order:
* Allow you to save your creation and send a link to someone else.
* Support "-let" rhythms (triplets, for example)
* Use multiple staves
* Set the tempo
* Allow other time signatures (time changes would be good too)
* Choose a different voice for each staff<p>The great benefit here would be simple composition without having to worry about all of the stuff associate with making a real score. So much of music notation is about making stuff that prints nicely, which is actually a separate process from just creating the music. And, of course, being able to easily share it with colleagues without requiring them to have the same software I do (or to download a file and open it in that software).<p>And to answer the followup question that you'll ask: Yes, I'd be willing to pay for this.