[1] The score featured a diverse collection of influences of music genres: European romanticism, gypsy jazz, folk-pop and traditional elements of Parisian café sounds.

In addition to the score, Giacchino wrote the main theme song, "Le Festin", about Remy and his dream to be a chef.

In October 2015, coinciding with Ratatouille's premiere at the Royal Albert Hall, London, Giacchino conducted a live orchestral performance at the venue, which received widespread acclaim.

The soundtrack received critical acclaim, with Empire magazine called the score as one of "Giacchino's best" and further added "Certainly, there’s a heavy dose of predictability here given its use of practically every French music cliché there is (albeit rendered in a stylish jazz/waltz/salsa style), but the sheer verve, infectiously upbeat tone and creative use of special instrumentation swiftly renders that criticism moot - it’s never less than utterly enjoyable.

"[12] James Christopher Monger of AllMusic called it as a "lively and endlessly inventive soundtrack that strikes a perfect balance between the old European drama of Ennio Morricone and the unhinged whimsy of Raymond Scott".

He further wrote, " Like an Old World version of Giacchino's jazz-infused, comic-book-kissed score for The Incredibles, Ratatouille is both elegant and mad, built around a sweet and playful theme called "Le Festin," which is presented both instrumentally and vocally (sung by the charming French star Camille) and is as timeless as the dish for which the film is based.