In a bit of last-minute shuffling, John Tomlinson will sing the Death Scene from Mussorgsky's Boris Godunov, replacing Pape.
James Morris will sing Wotan in the final scene of Wagner's Das Rheingold, replacing Pape.
John Relyea will sing "Le veau d'or" from Gounod's Faust, replacing Morris.
The 125th Anniversary Gala conducted by James Levine begins at 6:00 pm and will be broadcast live on the Metropolitan Opera Radio Sirius channel 78 and XM channel 79.
For complete Gala program information visit the Metropolitan Opera.
Tickets, priced from $125-$1,883, sold out at the lower price levels but a number of premium seats remain. Click here for tickets.