I’ve posted about Outshouts before. It allows you to send songs (and post them) along with audio and text messages that the user creates. As I’ve mentioned in prior posts, though, it’s possible that some of the songs the site has available might be inappropriate for classroom use, so it should be used with supervision — if at all.
The same company has just created Video Outshouts. This one lets you record an audio message and send a music video along with it. One nice thing about Video Outshouts (which appears to be different from its other version) is that you don’t have to register in order to use it. However, I offer it with the same caveat that I gave about the first version — some of the songs might not be appropriate for classroom usage.