Elementary Students

https://www.classicsforkids.com/music/musical_periods.php

kidsmusiccorner.co.uk/composers/classical/

More advanced information for older students:

http://www.naxos.com/education/brief_history.asp

This is a great link that provides a list of many other links

on a variety of subjects related to Music History.

http://www.soundpiper.com/mln/musichistory.htm