Pretty much most of my life I thought everyone had this (as well as vivid imagination) but now I dont think its as common. Like I can cue up any song in my head and it plays through, all the instruments relatively separated etc. A similar thing happens for writing music, I can write song after song and rarely feel like I “dont have any ideas”.
Sometimes I wish that power could actually be utilized…
I’m not even a musician but I can use my brain like an MP3 player or make up my own songs for fun. I’ve learned to turn it off and on at will and make it play whatever I want.