Question: The Robbie Williams album "Live at Knebworth" is a compilation of songs performed during shows at a festival that began in what year?
Sentence (from "Robbie Williams: Live at the O2"): Robbie Williams: Live at the O2 is a live album released by British singer-songwriter Robbie Williams on 24 November 2012, as a commemoration of his live performances at The O2, London on 22, 23 and 24 November 2012.
Relevant evidence: No