sentences:  He played the mandolin on the track as well as sharing vocals with Jack White, Brendan Benson, and Ashley Monroe.In 2011, Skaggs, along with other musicians including the Irish band The Brock McGuire Band, released their album 'Green Grass Blue Grass", an exploration of the connection between Irish Traditional Music and American Bluegrass and Appalachian music.Also in 2011, Skaggs contributed to "Moody Bluegrass TWO...Much Love", a bluegrass tribute album to the British Progressive Rock band the Moody Blues.