Hi Brownsfan - I would certainly agree that a case for Britten in a top 15 is a very strong one.
@Newbee - it could be argued (and I have, against no less an authority than Robert Greenberg) that Wagner had a greater effect on the development of music than any other artist has ever had on their particular art. He is the textbook definition of a true iconoclast. As influential as Beethoven was, music still developed along roughly the same lines after him - whereas after Wagner, it splinters off into all kinds of different reactions, both for and against what he did. Harmony in particular was changed forever.
@Newbee - it could be argued (and I have, against no less an authority than Robert Greenberg) that Wagner had a greater effect on the development of music than any other artist has ever had on their particular art. He is the textbook definition of a true iconoclast. As influential as Beethoven was, music still developed along roughly the same lines after him - whereas after Wagner, it splinters off into all kinds of different reactions, both for and against what he did. Harmony in particular was changed forever.