What Macdonald calls Berlioz's monumental manner is more prominent in the "Te Deum", composed in 1849 and first heard in 1855, when it was given in connection with the Exposition Universelle. By that time the composer had added to its two choruses a part for massed children's voices, inspired by hearing a choir of 6,500 children singing in St Paul's Cathedral during his London trip in 1851. A cantata for double chorus and large orchestra in honour of Napoleon III, "L'Impériale", described by Berlioz as "en style énorme", was played several times at the 1855 exhibition, but has subsequently remained a rarity.