Repetitive is not the problem. I think a track with score >= 9 should be memorable, which means I can't help humming it when relaxing.
Got it! :0) But you have for example.. tons of Tangerine Dream or Klaus Schulze tracks without melodies. Or "hidden" melodies. Chords or shapes of textures doing it.
Their best works. When melody emerges from cacaphony and you realize the structural elements of the tune were buried in the "noise" the whole time.
https://yewtu.be/watch?v=AqzgGfxFSNk
That's the kind of music I listen the most this last years..
I am not able to provide an example. But I feel that when humming, a track with drums will make it easier.
