These are a couple video demonstrations of musician Anthony Dickens’ Circle Guitar, a guitar with a rapidly spinning disk that strums the strings, so a performer only has to fret. There are also buttons that activate various effects, and the guitar is MIDI and DAW compatible. Some more info about

This is a video of guitarist Luca Stricagnoli covering The Beatles’ ‘While My Guitar Gently Weeps’ on acoustic guitar along with his latest invention, the “reverse slide neck”, attached to the bottom of the instrument. Luca says the slide can easily be attached or removed in a matter of seconds,