Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Check out the Gillian Welch guest vocal!

Guitar picker James Alan Shelton has a real smooth touch on the Martin flattop; here he steps out from his supporting role helping anchor Ralph Stanley's band to lead another fine, mostly-instrumental album of his own. Ralph Stanley II, mandolinist John Rigsby, banjo picker Steve Sparkman and others join in; Gillian Welch and David Rawlings sing on the gorgeous gospel tune, "Fifty Miles Of Elbow Room," which is certainly one of the album's highlights. Some of the instrumentals are a little too formal and less fiery than some bluegrassers might like, but it's still lovely stuff, with flawless musicianship throughout.