Part of the “James Corden and Friends Public Domain Song Concert-Palooza,” Corden and Groban opened with “Bah Bah Black Sheep,” which Groban said is his favorite song about wool.
The duo also tackled “The Muffin Man,” but Groban seemed to get more and more agitated with each new public domain song. He had a brief respite when he tried to sing the opening of Neil Young’s “Old Man,” but Corden jumped in to stop him.
“CBS has no music budget, right?” Groban said. “No,” Corden responded. “All their money goes to Jim Parsons.” But “Big Bang Theory” references aside, Corden and Groban launched into “This Old Man.”
Groban came alive during the song, saying he finally understands how beautiful public domain songs are. So he offered to “Groban-ize” the song with Corden, which included bringing out a children’s choir to sing along.