Task: Explanation
Input (English): "Merry Xmas Everybody" is a song by the British rock band Slade, released as a non-album single in 1973. The song was written by lead vocalist Noddy Holder and bassist Jim Lea, and produced by Chas Chandler. It was the band's sixth and final number-one single in the UK. Earning the UK Christmas Number One slot in December 1973, the song beat another Christmas-themed song, Wizzard's "I Wish It Could Be Christmas Everyday", which reached fourth place. It remained in the charts for nine weeks until February 1974. Question: How many copies were sold of the last UK number-one single that was written by Noddy Holder and Jim Lea? Answer: in excess of one million copies
Output (English):  It was the bands sixth and final numberone single in the UK.