How does "Renaissance Music" compare to the sound, instruments used in "Classical Music"?

Renaissance music is not the same as music from the Classical period, but many people use the umbrella term "classical music" to describe all music which was written before the 20th century. For some useful tips on the difference between Renaissance and Classical see a href="http://blog.mymusictheory.com/?p=169." rel="nofollow"http://blog.mymusictheory.com/?p=169./a