I sometimes wonder what Mozart would think of a particular modern piece of music, usually when it's incredibly different from anything he ever heard. Genius that he was his reaction would have to be amazing and noteworthy. Same is true of Bach or Beethoven, many other great musicians of the past as well, but Mozart is generally the one who comes to mind when I have such ruminations.
I'd say he'd be pleased with Yasunori Mitsuda and Mariah Carey. You're So Cold develops in a manner that manages to parallel to an Adagio-Allegro from Mozart or early Beethoven's time.
Mitsuda, has a similar facility with melody in which he doesn't need many notes. Chrono Trigger starts with the soothing "Peaceful Days", but there's a wide variety of tracks. His impact extends to populations that one may not expect; Wiz Kalifa sampled Schala's Theme.
As some tracks are composed by Uematsu, I'll put this link.
https://en.wikipedia.org/wiki/Music_of_Chrono_Trigger
All on some very limited equipment(SNES synth)
They both also "stole" some material. But I guess, masters can get away with it because...
Carey might as well have made opera pop again.
Mozart appreciated musicality. The 17th keyboard concerto proves valuable because it wasn't for his own performance, but a student of his, Barbara Ployer. Due to her being musical but not possessing all the powers of her teacher, sections that would be left bare if Mozart were performing himself are written out.
Geza Anda was quite musical in his performances of the Mozart concertos...to me, even his cadenzas though not close the Mozart, do possess the "musicality" that make them fit better than other pianist's attempts to do the same.