From the Disney Parks YouTube Channel:
The Welte Orchestrion has called the Main Street Penny Arcade home for decades. The Disneyland Electromechanical team has been working to restore the Welte as close as possible to its original condition. Now this impressive instrument is back in its place in the Main Street Penny Arcade, entertaining Disneyland park guests once again with its classic tunes. Take a look in this video from Disney Parks Blog author Shannon Swanson
http://www.youtube.com/watch?v=aYAfX6pZP04