Two of Bauer’s radio stations merged at 4pm Thursday after a problem at One Golden Square.
The output of digital station heat was heard on Planet Rock, complete with heat idents and a top of the hour opener by Rihanna.
30 seconds after Rihannastarted, Planet Rock’s Music News with Paul Anthony started playing over the top of the pop song We Found Love.
A mash up of guitars and dance beats followed until the fail was fixed around six minutes past the hour.
The incident didn’t go unnoticed on Twitter, with a number of comments made by listeners.
Meanwhile, Planet Rock has a new logo – just launched this week.