Singing a Gainsbourg song isn't easy. He likes his syllables unnaturally stressed or flattened, lengthened or sharpened; he enjoys writing with unequal, undulating metric; he's fond of enjambements that break—across different verses—single sentences and, sometimes, even single words. Many of his lyrics frolic in wordplay; they delight in polysemic and homophonic terms—disseminating multiple meanings and messing with similar sounds...