There are, at least, two groups by this name. Ballyhoo (without the exclamation mark!) is a South African group who had a huge hit in 1980 in their homeland with their single 'Man On The Moon'. This South African group is still going strong. The other group with the same name (but with the exclamation mark!) is from Maryland, USA, a modern rock/reggae party band, active since 2006.
These are videos from concerts where Ballyhoo! played, so they may be of other bands that played the concert as well.
Vans Warped Tour 2012 Jul 6, 2012 Auburn Hills, Michigan, United States Added by Cardi
Vans Warped Tour 2012 Jun 27, 2012 Chula Vista, California, United States Added by Rorb
