Progressive bluegrass is one of two major sub-genres of bluegrass music. It is also known as Newgrass, a term attributed to New Grass Revival member Ebo Walker. Musicians and bands John Hartford, New Grass Revival, The Dillards, Boone Creek, Country Gazette, and the Seldom Scene pioneered innovations in the genre. Some groups began using electric instruments and importing songs from other genres, particularly rock & roll. Progressive bluegrass became popular in the late 1960s and 1970s, but it can be traced back to the banjo and contrabass duets that Earl Scruggs played even in the early days...