[MadcapJake]

4) Just wrote https://github.com/MadcapJake/language-alda for Atom. (Atom has the great https://github.com/atom/vim-mode package and for the parent, though it seems less complete, there's https://github.com/avendael/atomic-emacs)

Also in regards to the parent's interest in having a keybind to autoplay alda files, there is https://github.com/lsegal/atom-runner and with a short snippet in your config you'll have `alt-r` recognize alda files and play them!

For the language-alda package, I'm working on integrating autocomplete support for instruments, markers and attributes. I think I can also add support for atom-runner directly through the language package too.

Between playing around with the langauge and getting tooling support in Atom, my whole Sunday was completely swallowed up! :P