But more importantly, the band seems to have managed to put their sound over with the fans, and this indicates that bluegrass has managed to escape the trap of being a niche market that is hostile to innovation. It bodes well for the acceptance of new groups into the bluegrass culture while still preserving the ineffable drive and rhythm that makes bluegrass what it is. Other bands like The Infamous Stringdusters, Nickel Creek, and Crooked Still (not to mention Old Crow Medicine Show) have ventured away from the "true vine" bluegrass sound, but The SteelDrivers seem to have actually expanded the boundaries of what is still considered "real bluegrass" — no mean feat.
The SteelDrivers have provided a sound that is not really a fusion of Delta blues into bluegrass so much as an illustration — mainly from Stapleton's vocals — that the influence has always been there. Had a different, high-tenor done the vocals, this probably would have been a good but middle-of-the-road bluegrass record. With Stapleton doing the singing, it has a burning vitality that makes it really stand out.