What are the most memorable landmarks in the music of the Baroque era How did these influence the future of Western music?

Check out Monteverdi, Purcell, Handle, Vivlady, and the Bach family - J.S Bach is clearly the most important one today, although his children (mainly Carl Philip Emanuel Bach) had much more influence in their lifetime.

1750- J.S.Bach's year of death- is generally considered the end of the Barouque period in music.

Also: http://en.wikipedia.org/wiki/Baroque_music

really, people.