Classic rockers Van Halen on Thursday abruptly postponed more than 30 tour dates, including their show in Cincinnati.
The postponements will begin after their June 26 concert in New Orleans, representative Anna Loynes said.
No explanation was given and there was no word on when the appearances might be made up.
Thirteen shows, including Saturday's concert in St. Paul, MN will go on as scheduled.
The band is on tour in support of its new album A Different Kind of Truth - the first complete album with original lead singer David Lee Roth since the platinum-selling 1984, which was released on the last day of 1983.
Van Halen, which formed in 1974, has a turbulent history.
Roth left the band in 1985 after a falling out with guitarist/founder Eddie Van Halen and was replaced by vocalist Sammy Hagar, who was with the band until 1996.
Former Extreme vocalist Gary Cherone joined the band for 1998's Van Halen III - the worst-selling album of the band's career.
At different times, Eddie Van Halen has undergone treatment for alcoholism and cancer.
The band was inducted into the Rock and Roll Hall of Fame in 2007 and later that year announced a reunion tour with Roth again fronting the band.
The band also has replaced original bassist Michael Anthony with Van Halen's son Wolfgang.
Several shows during the 2007-2008 tour were also postponed, but ultimately rescheduled.
Van Halen was slated to perform at the US Bank Arena on 8/12.
According to the Recording Industry Association of America, Van Halen has sold more than 56 million albums.