I think that with Wright's keyboard in all the songs made them richer in music and melody. In Comf Numb, WYWH, Saurcerful of Secrets (awsome turn after the psychotic music to the keyboard chords), nearly all of DSotM and alot of other songs aswell are special due to the wonderfully worked keyboard. Thats what made the floyd so good at their music, playing simple riffs on instruments (not in all the songs) and adding up the sounds of all the instruments giving an excelent combination. A perfect example to support this oppinion is the drum solo in One of these Days, where you may find it an amaizing solo because you aren't used to Mason doing that kind of complex drumming.

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...Lust, Love and Dedication... <Sorrow> -PiNK FlOYd-