I'm an avid listener of the ambient/noise/experimental genres and have experienced a "trace-like" state on a few occasions; I've always attributed this to the repetitive characteristic(s) of the song in question.
dissociative state is certainly a better descriptor and more appropriate than trace-like. a prolonged hypnagogic state has occurred on on several occasions as well.
examples that come to mind:
Zoviet France - Cycloptic Sub Alien: https://www.youtube.com/watch?v=rVz2qCvjPDg
Zoviet France - Mohnomishe: https://www.youtube.com/watch?v=hsBD-pUO4GI
Laraaji - The Dance #1: https://www.youtube.com/watch?v=_hes0hRY9v8