International Music Score Library Project (IMSLP) Portal
Target Audience: Music Teachers
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Link: http://imslp.org/
While not reading material, this site is great for music teachers. From their website: “Welcome to the portal page of the International Music Score Library Project (IMSLP)! We at the IMSLP believe that music should be something that is easily accessible for everyone. For this purpose we have created a music library to provide music scores free of charge to anyone with internet access, with several other projects in planning. IMSLP is also entirely collaborative, and all contributions are greatly welcome.”
One collection is the Petrucci Music Library. “The Petrucci Music Library is an internet-based collaborative music score library, and is currently the main project. You will find tens of thousands of scores composed by thousands of composers here, all available for free download.” On the site you can browse music scores by composer (alphabetical), by composer (time period), by composer (nationality), or browse by instrumentation or genre (New!). The IMSLP Project have active user forums to assist users.