If I listen to anything in a massage chair, or even my full motion waterbed, it's music/sounds designed for relaxation more than entertainment. I like listening to the Tibetan bowl sounds, Solfeggio frequencies or whale sounds and such. Have to be careful though because some of these tones (like a steady 528hz tone) are pretty intoxicating. Other things I like to listen to are chants and other mesmerizing sounds/harmonies.
Regular music or video I like to be seated and focused, although, music will keep me in bed if I am on the waking side of that cycle, otherwise the music will just knock me out before getting thru a whole song, more often than not. When listening to music, I don't read much more than album credits. I can stare at the song list while listening without being distracted. I'd close my eyes but I also like having my speakers in sight while listening.
Massage chairs end up being like that super heavy hideaway bed that someone is always trying to push off on someone else. There's one at our shop that another worker "donated" and it's piled with junk on it. Nobody ever used it.