F(OS)S for Learning a Musical Instrument ?

Anonymous Musician asks: "Recently I took up learning to play the violin (at age 37) and it is great fun. I found two little software tools to be of good help: Wired Metronome (Windows binary, free to download) to keep a steady beat, and TS-AudioToMIDI (Windows binary, shareware, 30 days free trial), using a microphone and built-in sound-card to detect in real time the note I am playing (I admit, sometimes it is more like a noise) and have it displayed on a piano keyboard to check and train my tuning. What tools, freeware or FOSS, are you using to assist you with learning to play an instrument?"

Comments

Re:Tuxguitar

[xtracto]

Error in java lanucher. Error ocurred while attempting to find Java class org/herac/tuxguitar/gui/TuxGuitar

Mmmm... so much for the Open Source is better than...