Just a guess: most musicians write their own lyrics which gives much more insight into who they are. Actors are always wearing masks.
There are movies that have affected me profoundly but I'd have to watch them again in the right circumstances and mood to even hope to be similarly affected a second or third time. But there are songs and albums that I'd argue will always get an emotional reaction from me barring some weird scenario where I had to listen to them on repeat for days until they were worn out.