If anyone is interested in seeing a really large organ...
...here it is:
The Wanamaker Grand Court Organ, in Philadelphia, Pennsylvania, is the largest operational pipe organ in the world (as measured by the number of ranks, therefore outranking the Boardwalk Hall Auditorium Organ in one way), located within a spacious 7-storey court at Macy's Center City (formerly Wanamaker's department store). The largest organ by some measures is the Boardwalk Hall Auditorium Organ (which is barely functional currently). The Wanamaker organ is usually played twice a day Monday through Saturday, but more frequently during the Christmas season. The organ is also featured at several special concerts held throughout the year, including events featuring the Friends of the Wanamaker Organ Festival Chorus and Brass Ensemble.
More at the link: http://en.wikipedia.org/wiki/Wanamaker_Organ
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for more than 4 hours?
...playing anything like that. 
Just for you:
Seriously, you do wonder why someone would spend that much time and money to make an instrument that has one note.
It WILL play the first 8 bars to the song "One note samba" plus most Rap songs.
glad to hear it
...just incorrigible. 
"Only the one."
...I don't play.
All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. ....
