If you're looking for an open-source sheet music renderer, I'd point you to http://www.vexflow.com/ http://www.vexflow.com/, which can render to Canvas or SVG (

If you're looking for an open-source sheet music renderer, I'd point you to http://www.vexflow.com/ http://www.vexflow.com/, which can render to Canvas or SVG (using Raphael for the latter). It's a barebones visual rendering library, so audio and things like MIDI interpretation/beautification are out of scope, but there have been various experiments making editors and different cool applications with it. It's MIT licensed and decently documented, too! Also of note (haha) is http://www.noteflight.com/ http://www.noteflight.com/ which has a fully functional Flash editor and is slowly but surely reaching feature parity on a beta HTML5 version. I'm excited that there's competition in the space - it can only lead to great things!