Between 1990 and 1993, at a time when rap was not yet on the radio in France, Olivier Cachin hosted a musical TV show on M6 called "RapLine". The show exclusively devoted to rap and other alternative music. This cult show presented all the facets of these emerging movements through interviews, lives and clips made especially for the show, around fifty clips were produced by RapLine. Another sequence of the show consisted of broadcasting new US rap clips subtitled in French.

"L'Argot Sous Un Garrot" is the first documentary dedicated to the work of rapper Booba. How is this major artist considered by society? Writers, journalists, linguists and students decipher the hidden face of the greatest French popular artist. Titled after a line dropped almost twenty years ago on the song Repose En Paix, the documentary aims to revisit, not Booba's life, but something rarer, his music as such.