The First Time I ever Saw This

Th Violinist in the Nottingham Ensemble used an iPad Music Stand with an AirTurn gizmo at his feet to turn the pages.

I sat in a row behind the violinist so I could see he was reading his music score off an iPad, but couldn't see how he was turning the pages.  I surmised he must be using his feet and sure enough he had one of these gizmos on the floor by his music stand.