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Billy Joel, Robert Plant among Bonnaroo headliners

Billy Joel, Robert Plant among Bonnaroo headliners

Unlike Coachella, Bonnaroo doesn't have an iconically typefaced poster to herald its acts every year. But this year, the Tennessee festival has a throwback means of announcing its lineup -- a toll-free call line.

On Tuesday afternoon, the festival invited fans to call a phone number to learn the name of one individual act performing. Instead of a single statement of its artists, the fest is asking fans to trickle out lineup information across social media. 

The top of the bill confirms that this is the year that Dad Rock took over American music festivals: Billy Joel and Robert Plant are two of the main headliners, along with Ben...

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