Alison Krauss

It was announced on Friday afternoon that Nelson would be taking a few days off per doctor's orders.

Live version of the Led Zeppelin classic is the duo's first official release in two and a half years.

Duo began their trek with a performance in Tulsa, Oklahoma.

The trek begins June 2.

Gov't Mule, the Avett Brothers and many other acts will appear on various dates.

it led to a very neat little celebrity sighting

The duo's March performance at Red Rocks will be available as a worldwide stream.

Led Zeppelin legend felt "exposed and vulnerable" as duet album ‘Raising Sand’ began to form.

Lead single "Can't Let Go' finds the duo covering Lucinda Williams.