Oxegen headliners Kings of Leon reportedly threatened to pull out of the festival after experiencing sound difficulties at T in the Park.
According to The Sun, lead singer Caleb Followill smashed up his guitar at the end of the group's T in the Park set, throwing the broken frame of the instrument into the crowd.
A source said: "He was livid about the sound and took out his anger on stage without considering the consequences."
"His guitar is now ruined. The crowd were oblivious to the sound difficulties but the Kings want every show to be perfect."
"When they came off stage, tempers flared... It was really nasty before their tour manager stepped in. They were even threatening to pull out of Oxegen."
However, Kings of Leon did travel to Ireland the next day to headline Saturday night at Oxegen Festival.