The British Library has reconnected a Mozart manuscript that was torn apart by the composer’s widow. “The single sheet of music was produced by Mozart when he was 17. One one side of the manuscript are two piano cadenzas and on the other a minuet for string quartet. But in 1835, 44 years after her husband’s death, Constanze carefully cut up the manuscript so that the two cadenzas ended up on separate sheets – bar one note that she lopped off the upper piece by mistake.”