Comment It is also still what computer music uses (Score 1) 106
If you compose music on a computer, you almost certainly still do it with MIDI. All the new highly advanced synths and samplers still use MIDI as their input for data. Everything from big dollar stuff like Native Instruments Komplete down to freeware. MIDI goes in, sound comes out.
In some ways it surprises me since you'd think they would get around to improving it (there are some things MIDI leaves to be desired) but on the other hand it does work well for nearly everything and there's something to be said about keeping things standard. You can literally take one of those old General MIDI songs and feed the data in to a modern sampler. I do just that all the time to remake old game soundtracks because I enjoy it.