Louisville-based Hog Operation is a four-person ensemble known for high-energy performances of American roots music, including bluegrass, blues, Celtic, country, and rock. Members Steve Cooley (banjo), John Hawkins (guitar), Larry Raley (bass), and Mike Schroeder (mandolin) use traditional instruments to accompany their smooth harmony vocals. For In Performance, they accompanied four champion cloggers—Stacy McWethy, Trevor DeWitt, Cristy Corwin, and Zach Davis—of the Bluegrass Cloggers.