Given the following reasoning and answer, what was the question? To answer the above question, the relevant sentence is: "Tubthumping" (also known colloquially as "I Get Knocked Down", after the first line) is a song released by British rock band Chumbawamba in 1997.
The answer: Chumbawamba
The question Passage: "Tubthumping" (also known colloquially as "I Get Knocked Down", after the first line) is a song released by British rock band Chumbawamba in 1997. It was their most successful single, peaking at number two on the UK Singles Chart. It topped the charts in Australia, Canada, Ireland, Italy, New Zealand and peaked at number six on the US Billboard Hot 100 (although it topped the US Modern Rock and Mainstream Top 40 charts). At the 1998 Brit Awards, "Tubthumping" was nominated for the Brit Award for Best British Single. As of April 2017, the song had sold 880,000 copies in the UK.

Question: Based on this passage, who sings i get knocked down but i get up again?