LED ZEPPELIN singer ROBERT PLANT appears on the new single from folk singer and his romantic partner PATTY GRIFFIN. The haunting folk ballad 'Ohio' "is a story about the Underground Railroad, about slaves escaping," Griffin tells Rocksquare.com. "It's inspired by something I read in a Toni Morrison novel a few years back."

According to Griffin, he played a key role in arranging the song.

"I had the song in an odd shape and couldn't really figure out how to use it," she said. "He came in and arranged it so that it became what it is. He came up with the tempo and the mood on it."

Check out 'Ohio' below:

ROBERT PLANT PRESENTS THE SENSATIONAL SPACE SHIFTERS has just announced its first North American tour dates. This dynamic and powerful new incarnation of Plant’s musical vision has been touring the world, most recently in Australia and New Zealand. The dates begin June 20 at the Dallas, TX, Palladium and end July 27 in Brooklyn, NY’s Prospect Park. The band will be playing five festival dates, including Britt in Jacksonville, OR, High Sierra in Quincy, CA, Jambase in George, WA, Portland Blues in Portland, OR, and Forecastle in Louisville, KY.

View the tour trailer below:

One of a generation of British kids, drawn without rhyme or reason, to sounds from a far away world. A world of field holler, despair, Levee camp and chain- gang moans; of Saturday night fish-fry and Juke Joint foot stomp. A million miles lay between the brooding pulse of Mississippi Delta life and the sanitized shelter of the timid English boy, circa 1962.

Fifty years on — drawing from a lifetime of adventures, tracking the dark, beautiful resonator, Plant follows his heart and lifts his voice higher and joyous ever away. A voice of experience and learning from the sounds of Southside Chicago Electric Blues; of Griot mantras from West Africa; from Louisiana Dance Halls; Greenwich Village Folk hangover; Haight Ashbury indulgences; Moroccan medina breakbeat; the early English radical techno materials, Texas two-step and Bristol Dubstep.

Before his recent projects in Nashville with ALISON KRAUSS and BAND OF JOY, Plant worked alongside the very interesting force, Strange Sensation, recording the critically acclaimed, multi-Grammy nominated albums - Dreamland and Mighty Rearranger. From this platform, Sensational Space Shifters has developed. Now together these confederates and conspirators dig deeper and more intensely, always twisting and turning, bringing the past into a brilliant technicolour present.

The band is:

Justin Adams – guitar, bendir, vocals

John Baggott – keyboards

Juldeh Camara – ritti (one stringed African violin), kologo (African Banjo), talking drum, vocals

Billy Fuller – bass guitar, vocals

Dave Smith – drums and percussion

Liam “Skin” Tyson – guitar, vocals

Plant revels in the excitement generated by the collision of these remarkably powerful forces. Though his contribution to pop culture began with his work with Led Zeppelin, his path since has been uncompromising: keep it fresh, spin the bottle, dig deep, embrace the past – visit it – celebrate it – but don’t build a home in it.

The confirmed tour dates are below:

June

20 - Dallas, TX - Palladium
21 - Houston, TX - Bayou Music Center
23 - Austin, TX - Moody Theater
26 - Los Angeles, CA - Shrine Auditorium
28 - Santa Barbara, CA - County Bowl
29 - Berkeley, CA - Berkeley Greek

July

2 - Jacksonville, OR - Britt Festival
4 - Quincy, CA - High Sierra Festival
6 - George, WA - Jambase Festival
7 - Portland, OR - Portland Blues Festival
10 - Morrison, CO - Red Rocks
12 - Chicago, IL - Grant Park
13 - Memphis, TN - Live In The Garden
14 - Louisville, KY - Forecastle Festival
17 - New Orleans, LA - Mahalia Jackson Theater
19 - Atlanta, GA - Verizon Amphitheatre
20 - Cary, NC - Koka Booth Amphitheatre
22 - Vienna, VA - Wolftrap
24 - Uncasville, CT - Mohegan Sun
25 - Boston, MA - B of A Pavilion
27 - Brooklyn, NY - Prospect Park