ONBC is a Danish band. Mikkel, Ivan and Camilla have known each other for ages from a little town in southern Denmark and were once (un)known as Pierre.
They got back together in 2005, changed their name to Oliver North Boy Choir in 2006 and released their first single in 2007. Then they quit the band again, but couldn't live without each other, so they got back together in 2012.
To complete the quartet, Tanja (known from Superheroes and Private) joined the forces and the band changed their name to ONBC. Read more on Last.fm