Im very pleased that an app has finally been introduced that can play midi files with a nice-sounding piano sample. However, many midi files wont play properly. And the website where you can transfer midi files to your iPhone is frequently not available. Worst of all is the fact that when the iPhones display goes off, the music stops, so you have to remember to touch the screen every so often to keep the song playing. Still, with all these faults, its great to be able to play midi files.