At the start of the show , all six acts sang the 1974 Eurovision winner " Waterloo " by ABBA . The artists also gave two further performances on stage during the voting interval , with the girls performing '' " One Rock & Roll Too Many " '' from Lloyd Webber 's musical Starlight Express , while the boys performed '' " No Matter What " '' by Boyzone . It was also revealed that famous songwriter Diane Warren will write the lyrics to the winning song
1974 Eurovision
Eurovision Song Contest 1974
United Kingdom in the Eurovision Song Contest 2009