How can you have a "solo reunion tour"?

Arlo Guthrie Solo Reunion Tour "Together At Last" at The Paramount Theater of Charlottesville

http://www.virginia.org/site/description.asp?attrID=46068

Folk singer, musician, and composer Arlo Guthrie gave his first solo concert way back in 1961. In 1967, he penned "Alice's Restaurant," his satirical, dead-pan protest against the Vietnam War draft. He appeared at the seminal Woodstock music festival two years later. Guthrie has rarely performed alone since those Woodstock days, but now he hits the road solo, playing the piano, six- and twelve-string guitar, harmonica, and a dozen other instruments, weaving hilarious tales and anecdotes seamlessly into his performance. Group discounts available. Student rush tickets 45 minutes before the show.

'Together at Last'?