A better response would have been that Beethoven's deafness would have been easily cured by modern medicine, so he would have been able to listen to contemporary music.

Anyway, Beethoven loved poetry and I don't think the above example would have suited his tastes at all. He preferred Goethe, Homer, Schiller and Ossian, ie., the romantic and ancient poets.

In terms of music, he disliked purely popular composers (eg., composers who limited themselves solely to light Italian opera, light dances or simple songs). So he probably wouldn't have been interested in most popular music, with the exception perhaps of jazz.

On the subject of jazz, one of his late sonatas has a movement that is eerily similar to ragtime. Also I've always thought the first movement of his op 31 no 3 sonata had a light jazz feel. So he probably would have enjoyed some jazz music - especially the way jazz players treat harmony when writing variations - , but I'm guessing that's about as far as he would have gone into the realm of popular music.

When it comes to "serious" contemporary music (Beethoven thought of himself as a "serious" composer, whereas other light composers who he despised - like Rossini - he regarded as "popular"), he probably would have been interested in Schoenberg's philosophical legacy, even if he didn't agree with it.

I don't really think there's much more that can be said on the matter. Would he have liked Schoenberg? Ferneyhough? What would he have thought of Minimalism (probably too populist, and he certainly would have been incensed by what he would no doubt have seen as the plagiarism of the Moonlight Sonata by the likes of [Part}(https://www.youtube.com/watch?v=TJ6Mzvh3XCc) - Beethoven was paranoid about other composers stealing from him). But we can't really say.

Honestly, I don't know how much any of this means to you. But I tried to engage with your question at least.