The Tonight Show Starring Jimmy Fallon is prepping to air a pretty special episode on tonight that will be co-hosted by Dave Grohl. Together, the former Nirvana drummer and Foo Fighters frontman and talk show host will deliver the monologue, interview guests — comedian Jim Jefferies and musical guest Blake Shelton — and participate in any games the Tonight Show crew has planned. The appearance will mark Grohl’s fourth on The Tonight Show.