How long have David Crosby, Stephen Stills and Graham Nash been playing together? It was in 1968 during a party given by Cass Elliot of Mamas & The Papas fame when Nash provided impromptu harmonizing for a song Stills and Crosby were working on – “You Don’t Have To Cry.” That’s when the three vocalists realized that they might be on to something.

One year later, Crosby, Stills & Nash was released, and the rest, as they say, is history.

Dates include the June 3 tour opener in St. Louis at Chaifetz Arena, Toledo’s Zoo Amphitheatre on June 7, Foxwoods Casino in Mashantucket, Conn., June 13 and Boston’s Bank of America on June 14. Also on the U.S. schedule is Chicago (June 4), Detroit (June 6) and Cooperstown, NY (June 12).

The guys head for the United Kingdom and Europe two weeks later, playing Glastonbury on June 27, the Marquee in Cork, Ireland, on June 29, London’s Royal Albert Hall on July 1 and the Heineken Music Hall in Amsterdam on July 6. Other Euro dates include Bonn (July 3), Paris (July 4), Brussels (July 7), Manchester (July 10) and Edinburgh (July 11).

Between the U.S. and U.K. / Europe legs of the tour, Crosby, Stills & Nash will be inducted into the Songwriter’s Hall of Fame in New York City. The group was inducted into the Rock And Roll Hall of Fame in 1997.

The upcoming tour coincides with the new Rhino release: Crosby, Stills & Nash Demos, a single-disc collection of early versions of songs that would later become classics in the CS&N (and sometimes Y) songbook. Included are demos of “Marrakesh Express,” “Almost Cut My Hair,” “Guinnevere” and “Wooden Ships.”