Learn listening in a fun way!

Enter a music file and it's lyrics (or automatically take from the music file if available).
Click the Teach-tab, and OpenTeacher will start playing your music and show the lyrics, with some (randomly picked?) gaps.
There are several answer fields where you can type the words that should be in the gaps.
This way, you can learn listening, and it's fun too, because you can listen to music! (https://blueprints.launchpad.net/openteacher/+spec/make-openteacher-fun-to-use)