For me music is always a distraction to what I am doing. Reading a book, working on a project, talking with friends, walking on a shopping street with loudspeakers playing music: it ruins my pleasure and annoys me to no end and distracts me from my thoughts.
They same with medfet fantasizing - which given a dearth of partners is all I do. Music would be an intrusion, ruining the whole experience. Even if I ever were to try a play exam again (my so far first and only was a washout) I would also insist on dimmed lighting. Not out of prudery, but because during play exam imaginings, or even with real sex, light distracts and noise, certainly music be it rhythmic or not is an even bigger distraction.
Early in our relationship, my then gf and I tried out playing music during sex and it was very very disappointing. Ruined the session.
So it has remained for me even now. No music, not a note at all.
In fact, some years ago the government enacted a sort of tax on music played in stores, public buildings, and such. The piped music in our doctor's waiting was suddenly gone and was I ever so happy.
The only connection between music and medfet for me is that music ruins the experience. I want my medfet experiences to be intense and interior, coming from the mind. Music distracts the mind, so there you have it.