Vince GillVince Gill and Emmylou Harris will perform a duet together on Wednesday's 'Jay Leno Show,' as part of their trip out west to help a hallowed Nashville institution. Vince and Emmylou are part of an all-star lineup at the west coast All For the Hall benefit show, in collaboration with a similar show in Music City, both of which benefit the Country Music Hall of Fame and Museum.

The Oct. 1 show in Los Angeles also includes Melissa Etheridge, Dwight Yoakam and a few surprise guests, who'll all perform in an informal writer's round at the famed Club Nokia. The Oct. 13 show in Nashville will also feature Vince, alongside Keith Urban, Jason Aldean, Faith Hill, Taylor Swift, Lady Antebellum and Little Big Town.

Funds raised at both shows will go to help preserve and expand the Country Music Hall of Fame and Museum, which is gearing up for a $40 million expansion that will literally double the size of the building.