The difference is that pop music don't need to be titled with as many parts as a typical classical piece. Artist + title is enough as an identifier. In most cases, Artist is a single name (of a singer or a band), and title is usually succinct---not always, but usually. At most, there's an parenthesized .feat or .cover.

I have several bands who do release the same song several times. EG live albums, some do new versions and now without the limitation of record or CD length multiple takes of the same song in the same album