By 'in space' I mean the interstellar civilization that Guardians of the Galaxy and its characters all exist in, and the worlds that they frequent, of which Earth appears separated from.

In Guardians of the Galaxy, Peter Quill still carries with him his old Walkman and Awesome Mix tape he had with him when he was abducted 26 years ago in 1988. His ship also has a console tape deck that he could not have brought with him when he was abducted from Earth, which the Xandarians are able to duplicate easily when providing him with a new ship. This suggests that the technology exists to repair, maintain, and duplicate Peter's Walkman technology. This is also confirmed by the Word of God.

However, there are a few scenes that suggest that music (and personal music players) is foreign to the aliens in the movie. A prison guard confiscates Peter's Walkman, suggesting its value as rarity or novelty. And Peter introduces Gamora not just to Earth music but apparently music in general. She is both moved by it and does not know how to speak while wearing headphones. Gamora is also unfamiliar with dancing, although I believe Drax says his people dance.

And, if you've seen Guardians of the Galaxy Volume 2,

Peter is gifted a Zune. I forget by whom - Rocket maybe? - but I believe he incorrectly implies the Zune is the latest technology, even though the movie is set in 2014.

This seems especially unusual to me. If space tech can duplicate and repair Earth music players so easily, why are there no alien personal music players in space? I can understand that Peter might have an affection for his old Walkman and not just the music, but are there no music players in space other than what can be scrounged up from Earth? Why is listening to music so foreign to everyone? Is there no music in space?