I do not want to start too many hares running, but I suggest that if a newcomer to opera listened to La Traviata and then Il Trovatore, one after another, he or she would quickly identify the composer as one, no matter the different moods and key register. If the same listener did the same with Die Zauberflöte and La Clemenza di Tito I doubt that the listener would identify the works as being by the same composer.
Arthur Grumiaux (1921-1986) was never a technical daredevil and his playing has been described as being "for conoisseurs only." Indeed, his style was quite refined and his repertoire tended towards pieces that which suited his musical gifts. His Beethoven Concerto and Sonata recordings and performances are most definitely among the best ever done of those works. This large set of 30+ smaller pieces (with a couple larger ones thrown in) focuses on Grumiaux's ability to touch the listener and indeed there is a thread of imperturbable calmness that runs through this recording upon a casual listening. This discing on Philips came out around 1996, presumably to commemorate the 10th anniversary of his death. I'll just touch on a few of the highlights of this 2 CD set. In all of them, we hear Grumiaux at his best - polished and radiant, with Istvan Hajdu as the competent piano partner for all of the numbers.