There was a sound system mistake during KBS 'Music Festival'.

On the 'KBS Gayo Big Festival', which took place on the 30th in Yeuh Ee Do, many girl groups performed songs by 'Korea's Madonna' Uhm Jung Hwa.

Secret got on the stage as the third team for the medly. There were several coughs before the stage started, to the shock of viewers.

It turned out to be the mikes not being turned off of the girl group who performed right before Secret. KBS is getting much negative feedbacks from the netizens for making such a basic error.

On the other hand, on this broadcast of KBS 'Gayo Big Festival' Lee Seung Gi, Super Junior, B2ST, SNSD, Wondergirls, 2PM, Mblaq, Infinite, U-Kiss, Kim Hyun Joong, Secret, Miss A, Davichi, IU, Clover, and others made their appearances.