I'm that type of person as well - find a song that just resonates with a mood/mindset, put it on repeat, and usually have it at a higher volume level than usual. Usually I only do it for about a week unless something else makes me draw the period out longer (i.e. working on a cosplay that I associate with said song [i.e. "
Do You Wanna Date My Avatar" and "
I'm The One That's Cool" when I was working on my Codex cosplay]). I know I had listened to "
Paparazzi" by Girls Generation on repeat for a month or so.