La Renaissance
http://www.ibiblio.org/wm/paint/glo/renaissance
Many masterpieces of Renaissance art are featured at this WebMuseum, with informative text. Paintings from Italy, Netherlands, Germany, and France are included.

A Guide to Medieval and Renaissance Instruments
http://www.s-hamilton.k12.ia.us/antiqua/instrumt.html
This excellent site from an Iowa public school features text, photos, and audio examples of early musical instruments.

The Internet Renaissance Band
http://www.csupomona.edu/~jcclark/emusic/renaissa.html
A collection of midi files from composers and representative musical styles of the period. Composers and styles are listed alphabetically and can be heard directly from the screen.

Here of a Sunday Morning
http://www.hoasm.org/index.html
Chris Whent, host of a New York early music radio show, maintains this informative site on early music composers. Extensive material on musical eras and specific composers from Gregorian chant to the classic era is included here. Whent also provides early music web links and concert listings.