Founded by two singers, Izabella Caussanel and Lilla Orbay, Ephemere's members are nationally and internationally awarded young musicians. Their compositions are based on early twentieth-century jazz and chanson with a Latin atmosphere, nostalgically evoking the intimacy of a smoke-filled bar. The band's repertoire is extremely varied, featuring original songs, jazz standards, French songs and world music influences, all combined with a unique sound. The compositions are performed in Hungarian, French and English.

The word Ephemere is the French equivalent of mayfly. However, instead of its general sense, the band's choice of name gives the term a new meaning: their approach emphasises rebirth and the living of the moment. The contrast between their improvisational, jazzy style of playing and the composed music also make them instantly recognisable.