Beethoven was composing the finale for the C Major Piano Concerto, handing each page of score with the ink still wet to four copyists sitting in the hall, who were writing out the instrumental parts for a rehearsal the next day. At the same time Beethoven was wretchedly sick to his stomach, a familiar condition for him. So Wegeler watched his friend finish a rondo finale for piano and orchestra virtually in one sitting, his work interspersed with violent fits of vomiting. The next day Wegeler heard the concerto
Composing the C Major Piano concerto while vomiting, handing pages to 4 copyists for next days dress rehearsal
