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The issue here is, "physical" is a misleading word. Digital works are also held on physical media. The distinction is whether the work is stored on a dedicated physical object.

Edit: I suppose a jukebox confuses things as I think it belongs in the "physical media" box, but it isn't dedicated to a specific work. Hmm.

Maybe "mediumless" is the right word.

Although, if we want to pedantic: music stored on a hard disk is still stored on a medium, but you can't pop the hard drive into any old player and play the music.

Ethereal, Ephemeral?

I know what you mean but I can't think of any word that describes the concept (without requiring further elaboration).

"physical media" is an inaccurate, redundant, phrase.