Is there a single word that expresses "music end-users / enthusiasts"?

I don't think there is a widely understood one-word term for music listeners as opposed to artists. Most single-word options, if they exist, would probably sound strange to people.

Your best bet is probably two words that don't blend together spelling-wise too easily. I'd suggest musicfans.stackexchange.com.

I found this word: discophile.

^{(Donna Summer haters, relax. Contrary to your first impressions, the word does NOT mean "lover of disco music.")}

This word seems like it may be evolving a little bit as music media evolves.

TFD defines it as "a collector of or specialist in phonograph records." Merriam-Webster has a slightly more updated definition: "one who studies and collects phonograph records or CDs," and indicates the word has been in use since 1940. The Phrontistery has a more generic definition that fits in rather nicely with the O.P.'s desired word: "one who loves and studies sound recordings."

Then again, if that word doesn't suit your needs, there's always musicophile, which the OED labels as rare but defines quite simply as, "a music lover."