Crepax began to work as a graphic artist and an advertisement illustrator while still studying architecture (he degreed in 1958), producing posters as well as covers for magazines (including the Italian edition of Galaxy), books and LPs. The latter were mainly for classical music and jazz, including Gerry Mulligan, Fats Waller, Charlie Parker, Louis Armstrong, Italian Jazz Stars, but also for more popular works like 'Nel blu dipinto di blu by Domenico Modugno.
Louis Armstrong and his Hit Five "Rendezvous at the sunset café" 1956 firmata "g.crepax-'53