It sounds so strange, nonsensical, or hypnotic that it feels like someone created it after receiving some invisible, mysterious broadcast from outer space. It's a brainwashing device disguised as music. Once you listen, you start tuning into the same strange frequency.
https://denpa.omaera.org/ (English Guide for Denpa.)
https://dic.pixiv.net/a/電波ソング (You might be surprised to learn what songs are considered Denpa.)
Console:
X
CLEAR CONSOLE
/mu/ - Music
Edit
yeah!! Denpa!!!
Some of my favourites
https://www.youtube.com/watch?v=Goqk3hpL16E [Play] Not sure how many times I've listened to this track but it makes feel extremely relaxed to the point where I fall asleep.