The Free Music Archive offers free downloads under Creative Commons and other licenses. Can be used in your class, on class websites, or student projects.
I included this web-page because it mentions a Twitter group I like to check out called #langchat. It also archives chat sessions. Lots of practical-in-the-classroom idea sharing, especially regarding assessments.
This is a great site for ESL, EFL, or phonics level teachers. The site has lesson plans, printables, and game creators for students of any level. I highly recommend the song archive for young learners.