Leftover Salmon serves up "Blue Railroad Train"

The song features special guest and long-time Leftover Salmon pal Billy Strings who steps out on the track, showcasing tight vocal harmonies with Salmon's Drew Emmitt.

The disc is out on May 19 on Compass Records.

Co-founder, guitarist and lead singer Vince Herman is a tip of the hat to The Delmore Brothers, Doc Watson and Tony Rice.

"We had a good time making this record," said Herman to Bluegrass Situation. "Compass Records has a great studio in Nashville, where some great records have been made. Let's just say 'Aereo-Plain' by John Hartford was recorded there, and Outlaw Country was born there. It's a good place to make an album about roots, which is what we were after on this one. We cover the music that inspired us to be on this Polyethnic Cajun Slamgrass highway all these years. With guests Billy Strings, Oliver Wood and Darol Anger, we stop in on visits with Bob Dylan, David Bromberg, Link Wray, Dock Boggs and more of the sounds that made us who we are. Hope you enjoy our 'Grass Roots'."

The lead single was Bob Dylan's "Simple Twist of Fate."