Pappano, the music director of London's Royal Opera House, said last week that he would miss the concerts because he is replacing Riccardo Muti in an ROH production of Verdi's La forza del destino.
Barenboim, the CSO's music director, missed the orchestra's season-opening concerts in September with a back injury, but had planned to make his first Chicago appearances of the season as a piano soloist under Pappano's director on October 21, 22, and 23. He will now conduct the three concerts as well, leading Mozart's Piano Concerto No. 23 (from the piano), Schoenberg's Five Pieces for Orchestra, and Brahms's Symphony No. 1 The concerts had originally featured Haydn's Symphony No. 59 ("Fire") and Wilhelm Furtw‹ngler's Piano Concerto.
Metzmacher, the music director of the Hamburg State Opera and Hamburg Philharmonic, will conduct the CSO on October 13, 14, 16, and 19. Stravinsky's Symphony in Three Movement will replace Martinu's Frescoes of Piero della Francesca on the program, but Prokofiev's Symphony-Concerto and Mozart's "Jupiter" Symphony will be performed as planned.
Two injuries, coupled with Muti's withdrawal from the Royal Opera's Forza after he objected to changes in the set, have set off a small wave of substitutions on podiums in Chicago this fall. Andrew Davis, the music director of the Lyric Opera of Chicago, and David Roberson filled in for Barenboim at the CSO in September, as did David Robertson. Davis is also stepping in for Semyon Bychkov, who withdrew from a production of Aida at the Lyric with a shoulder injury.