I have seen many inquiries about the #38C3 pause/break music, particularly on Matrix and IRC. In case anyone here is interested: the default C3 pause music is “Elektroeule - Irish Coffee”. It's available on SoundCloud at https://soundcloud.com/philotue/irish-coffee and C3VOC has an MP3 of it available at https://github.com/voc/cm/blob/refs/heads/master/bundlewrap/data/voctocore-artwork/files/default-pause-music.mp3

Edit!

I have been told that it might also have been https://youtu.be/C23E5grsczE

or https://isit38c3yet.com/pausen.ogg

and if not then it's almost certainly in this directory somewhere:
https://c3voc.mazdermind.de/testfiles/