I've noticed that the term "digital music" is usually used to differentiate music that is usually obtained by download from music that is usually obtained on plastic circular objects known as CD's.
But of course the music on a CD is exactly as digital as a downloaded MP3 is. A CD is nothing but a set of large data files which encode the music as bits. It's a highly accurate encoding because there's no compression.
It's a bit weird to use a term which equally well describes two classes of entities as the primary linguistic means of differentiating one from the other.