Jared Falk
Jared Falk teaches how to play gravity roll (aka free-hand roll), invented by Johnny Rabb. It is about playing a continuous fraction with one hand, using the rim of the drum as a support for the stick.
Jared Falk gives everything in his usual way, step by step, chewing on each element.
You can order on the website - buy video school Jared Falk - One Handed Drum Roll