The Grammy Award-winning rockers of Greta Van Fleet were slated to perform to sold-out crowds in Nashville and Philadelphia this week, but had to postpone the gigs while their vocalist recovers from an illness.

The Nashville show was set to take place on October 13 at the Municipal Auditorium this past weekend, but the band released a statement calling-off the gig.

“With wholehearted disappointment, we must share that we are unable to join the beautiful people of Nashville tonight due to persistent illness,” the band said in a statement. “We wish we could’ve shared this news earlier, but have been doing everything possible to try and see you.”

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Now, the gig has been moved to December 16 at the same venue. The postponement follows another rescheduled show; their New Orleans concert on October 8 has been postponed to December 20.

Their March of the Peaceful Army Tour, in support of their new record, was supposed to wrap-up with a two-night show in Philadelphia on October 15 and 16, however, their lead vocalist Josh Kiszka is still recovering. The band took to Twitter yesterday to share the news.

“Josh has been fighting an illness the past couple of days trying to feel better, but unfortunately his symptoms have developed into the flu,” the statement read. “The only way to deliver the best performance for you is if we are all healthy. Thank you for your understanding, it will be tremendous to reunite for revelry.”

The Philly shows have been rescheduled to December 29 and 30.

Check out the full list of rescheduled tour dates below.

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Greta Van Fleet Rescheduled Tour Dates 2019

December 16 — Nashville, TN @ Municipal Auditorium
December 20 — New Orleans, LA @ UNO Lakefront Arena
December 29 — Philadelphia, PA @ The MET
December 30 — Philadelphia, PA @ The MET