Lynyrd Skynyrd and Foreigner, two bands from opposite ends of the rock spectrum, will join forces for a 19-date co-headlining tour titled "Double Trouble / Double Vision" that will come to Northwell at Jones Beach Theater next summer.

The general onsale for the Aug. 21 show at the Wantagh venue begin Friday at 10 a.m. at foreigneronline.com and lynyrdskynyrd.com .

Decades ago, the two bands would have been unlikely to share a bill. Lynyrd Skynyrd, formed in Jacksonville, Florida, in 1964, helped establish the shaggy sound of Southern rock and hit a commercial peak in the 1970s with two singles, the epic ballad "Free Bird" and the propulsive "Sweet Home Alabama" (written in response to Neil Young’s "Southern Man"). The band’s momentum was derailed, however, by a 1977 plane crash that

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