This Month's Composer
Music Time Periods
Instruments and Concepts
These are sites that have additional materials relating to composers and music education.
There are a variety of plans here. Many correspond to specific pieces like Peter and the Wolf and Young Person's Guide to the Orchestra.
Lots of plans that are indexed by grade level and concept.
Lesson Plans, Radio Shows, Activity Sheets and more.
Lots of lesson plans for specific pieces of music.
Great downloadable resource guides.
Lesson plans and online activities for kids.
A great resource with printable worksheets about lots of things.