^ Having said that, I can't think of any 'top' group (assuming it means anyone who had at least one top ten hit/album) I can't think of anything other than The Proclaimers unless the setter has misspelt Reo Speedwagon , The Eurythmics or The Associates
There's no group called The Countryside, I've gone through all my books I can't find any more 3, 11's. My original answer of The Colourfield could possibly fit then with its loose connection to countryside? Please let us all know the answer, this 'top group' clue is bugging me.