Stanford University's Denis Condon Collection of player pianos, piano
players and piano rolls is introduced in this YouTube video at

  https://www.youtube.com/watch?v=xsuPVBAwg4s 

In the first scene at time 0:09 is a push-up player with a transparent
case playing Gershwin's Duo-Art roll of "Sweet and Low-Down".  The same
machine is shown again at time 0:35.

The amassed roll collection now amounts to more than 7,000 music rolls.
This video shows the crew in Sydney, Australia, packing the rolls for
shipment:

  https://www.youtube.com/watch?v=TxPEmNvUNcs 

Robbie Rhodes, MMD