I know everyone is adding their favourite songs with the omnichord but Barnaby Dixon did a song with one too [0], you even get a brief look at the insides as he has to fix a solder joint. If you would prefer to skip the skit at the beginning here is where they start playing with it[1].

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[0] - https://www.youtube.com/watch?v=jfuSEdOdNz0

[1] - https://youtu.be/jfuSEdOdNz0?t=121