Their first album, Happening Songs, was self-produced and with entirely English lyrics. With their second album The sun is blue like eggs in Winter (also self-produced) Babet became a member. In 1999, they signed to a major label (the now defunct Trema) and released Haïku which brought the band in to the public eye, mainly thanks to the success of the single "Coccinelle".
The name of the band comes from the ancient Greek god Dionysus, which in French is Dionysos.
There are strong non-musical influences from Tim Burton and Roald Dahl. A lot of the songs are surreal and many feature nonsense lyrics (for example "Surfin Frog"). The albums Monsters in Love and La mécanique du cœur are set in a surreal world full of whimsical monsters and other fantastic characters which Mathias Malzieu has used as a setting for two original comic books. Joann Sfar illustrated the cover art for the comic books as well as the two albums. Sfar's eccentric and humorous brand of fantasy fiction as displayed in the Donjon comic books lends itself easily to the band's fantasy-humor albums.
The lead singer, Mathias Malzieu, is also working on other projects such as the career of Olivia Ruiz (his partner), and his other hobby : writing (published 4 books in 2002, 2005, 2007 and 2011). His second book is based on the same world as the album Monsters in Love, his third book on the same world as the album La mécanique du cœur. In the same way, there will be connections between his fourth book, Métamorphose en bord du ciel, but not to the same extent as La mécanique du cœur.