opera is "driven by the propulsive energies of Rossinian comedy" and the up-tempo galop, such lively numbers go side by side with statelier music in an 18th-century vein: "The score's sophistication results from Offenbach's intertwining of contemporary urban musical language with a restrained and wistful tone that is undermined and ironized without ever being entirely undone". was the first of Offenbach's major works to have a chorus. In a 2017 study Melissa Cummins comments that although the composer used the chorus extensively as Pluton's minions, bored residents of Olympus, and bacchantes in Hades, they are merely there to fill out the vocal parts in the large ensemble numbers, and "are treated as a nameless, faceless crowd who just happen to be around." In the Olympus scene the chorus has an unusual bocca chiusa section, marked "Bouche fermée", an effect later used by Bizet in Djamileh and Puccini in the "Humming Chorus" in Madama Butterfly. Editions The orchestra at the Bouffes-Parisiens was small – probably about thirty players. The 1858 version of is scored for two flutes (the second doubling piccolo), one oboe, two clarinets, one bassoon, two horns, two cornets, one trombone, timpani, percussion (bass drum/cymbals, triangle), and strings. The Offenbach scholar Jean-Christophe Keck speculates that the string sections consisted of at most six first violins, four second violins, three violas, four cellos, and one double bass. The 1874 score calls for considerably greater orchestral forces: Offenbach added additional parts for woodwind, brass and percussion sections. For the premiere of the revised version he engaged an orchestra of sixty players, as well as a military band of a further forty players for the procession of the gods from Olympus at the end of the second act. The music of the 1874 revision was well received by contemporary reviewers, but some later critics have felt the longer score, with its extended ballet sections, has occasional dull patches. Nonetheless, some of the added numbers, particularly Cupidon's , Mercure's rondo , and the "Policeman's Chorus" have gained favour, and some or all are often added to performances otherwise using the 1858 text. For more than a century after the composer's death one cause of critical reservations about this and his other works was the persistence of what the musicologist Nigel Simeone has called "botched, butchered and bowdlerised" versions. Since the beginning of the 21st century a project has been under way to release