Some favorites of mine are Bach, Beethoven, Brahms, Debussy, Arvo Pärt, Samuel Barber, Béla Bartók, Alexander Borodin, Dmitri Shostakovich and Nikolay Rimsky-Korsakoff.
As for a high point in music, a lot of great music is still being written. It's not like it's all pop music today or something. Pretty hard to get better than Beethoven, really, though.