We might have expected that the rising young bel canto tenor Lawrence Brownlee would include “Ah! Mes amis… Pour mon âme” from Donizetti’s La fille du régiment (that’s the number with the nine top Cs) in his Rosenblatt recital at St John’s, Smith Square – but what we might not have anticipated, after so taxing a programme as this, was that he would sing it again. That’s 18 top Cs (and the rest), which isn’t just cheeky, it’s a message: start looking over your shoulder, Juan Diego Florez - Brownlee’s breathing down your neck.