All nine
The Guardian's Tom Service mulls the musician and listener stamina required for a marathon performance of all nine Beethoven symphonies by conductor Martyn Brabbins and the Salomon Orchestra:
http://www.guardian.co.uk/music/tomserviceblog/2010/jul/13/brabbins-beethoven-nine-symphonies
H.L. Mencken and his friends in Baltimore's Saturday Evening Music Club thought they had to answer to getting through all nine: plenty of beer. They made it through the Sixth, but then . . .