As I am currently deeply involved in studying four-part harmony, I am interested to know some examples of composers and pieces, which heavily use the rules of four-part harmony and not wildly (subjective term) violate the them.
P.S. I am interested specifically in Western Classical Music, starting with Classical era and ending with Romantic era, excluding Baroque and Modern.
P.P.S. I heard in the interview of Vladimir Ashkenazy, that Rachmaninov was always very strong in harmony, during his studying years in Moscow Conservatory. Does it imply that he was using much of it in his later composition?