I needed someplace to put a phone or small tablet below my music stand. It's useful for running a metronome or tuner app, or recording auditions. By placing it below the stand my music doesn't get obscured and the phone is less likely to get knocked down.
Fits a phone or a small tablet like an iPad Mini nicely. The cut in the front is to let you put the phone in portrait with the cable sticking down through the hole in case you need power or a microphone plugged in there.
Two versions provided - one clips onto the black outer tube of a Manhasset #48 music stand, and the other clips onto the silver inner tube of the same stand. I prefer the inner one for this use, as it keeps the phone just below the music stand for easy access.