Despite what Bubblyrat said back in December of '09, we probably should call these instruments guitar banjos or guitjos and not six string banjos. I agree with him that guitjos are not what you want for playing bluegrass, but a six string banjo can be a very effective bluegrass or old timey instrument. Sonny Osborne and Raymond McLain both used 6 string banjos to play bluegrass and Sarah Jarosz uses one to play clawhammer. These are not guitjos, but banjos with five full length strings and a short thumb string usually tuned to a high G.