 The theme of the interior decoration is the "Triumph of the Cross".It employed Giovanni de' Vecchi, Cesare Nebbia, Niccolò Circignani, and Cristoforo Roncalli.It was also host of musical concerts, starting in 1639, when the first performances of fifteen musical oratorios [oratories] by Giacomo Carissimi and Emilio de' Cavalieri occurred here.