Damon Albarn has forgotten himself. It's Friday night at Tottenham Hotspur Stadium, and he's in the middle of rehearsals for Gorillaz' first ever stadium show - a multicultural, multimedia pop extravaganza, with more guests than a double-booked Airbnb. As the band launches into Dirty Harry, the long, pitch-side LED screens light up with a cartoon choir, singing the song's refrain, "all I do is dance". Apparently taken by surprise, Albarn jumps off the stage to watch, with a broad, toothy grin