Willie Nelson and Alison Krauss are reviving their co-headlining tour for a short U.S. trek this summer (15).

The country music stars embarked on a joint venture last year (14), but the tour got off to a rough start when Krauss was forced to axe seven shows to undergo a minor medical procedure for an urgent health issue.

Now they are teaming up again to visit nine cities on America's West Coast beginning in June (15), with the last stop in Berkeley, California in July (15).

Nelson, 81, has a busy summer ahead of him - in addition to his tour dates with Krauss, he's filming fantasy adventure movie Waiting for the Miracle to come, and releasing his memoir, It's a Long Story: My Life, on 5 May (15).