If you teach Music Technology, you simply MUST check this site once a month at a minimum. The Splice community area usually has at least one active remix contest where you can download professional STEMs (multitracks) to use in your own DAW projects / lesson plans. Your students will LOVE this!
This site provides instructional information and projects for anyone wishing to learn about sound mixing. There is a lot of good information and links to resources. This would be a good site for a recording technology class to visit.