Adam Schlenker on Instagram: "Here’s a little bit of John Henry improvisation from my practice session this evening. I’ve been listening to the Country Gazette album Strictly Instrumental a fair amount lately and this one’s on there. David Grier played guitar on it and I clocked it at 150bpm which is where I’m at here. He does some crazy cool cross string stuff on there that I’m still striving to obtain. #flatpicking #bluegrassguitar"