Hundreds of people flocked to a German church Saturday to hear an organ change chords for the first time in nearly seven years. The experimental piece, which consists of eight pages of music meant to be played very slowly, is intended to last for an entirety of 639 years -- meaning it will end in 2640 if all goes according to plan. The organ had been playing the same chord for six years and 11 months before Saturday's chord change Best known for a composition called 4'33" -- which is just four minutes and 33 seconds of silence -- Cage...