I have made a similar thread before on another forum and thought it would be even better to do so on a forum dedicated completely to music. So yeah, that's the idea. Just post a video or audio of yourself improvising on an instrument. It could be just you by yourself or you improvising over top of another person's work or even better a whole jam session. Just as long as it's improvised anything else goes. If enough people participate this could be a very cool thread, so please if you can then do so.
I've already posted most if not all my improvisations on one thread or another so you may have seen or heard these ones before, but if this thread takes off hopefully I'll have some new ones to post later on.