in the olympic park is because this is where the abba concerts are going to be taking place — but you won't be seeing abba as they are today, but rather with a degree of digital youthful enhancement. the group has been performing in a studio, and with the aid of motion capture digital effects, the image we will see and hear on the stage will be the band members in their �*70s heyday. to create, after the musicals and movies, another abba experience. but what makes this moment different is the new music. the new album. the reunion, a0 years on. david sillito, bbc news. fantastic group, aren't they? i would love to know what your favourite abba song is. tweet me at @bbckarishma. perhaps you can guess mind. there was some