Thank you for the comment and sorry for getting back so late!
I went through our sound assets folder and managed to find the original soundtracks from Pixabay with the help of Google.
In the main menu there is three tracks playing over each other:
https://pixabay.com/sound-effects/ambient-wave-48-tribute-17243/
https://pixabay.com/sound-effects/glitch-sound-static-noise-30279/
https://pixabay.com/sound-effects/static-w-lightning-tickles-78098/
I believe the first track might be what you were interested in.