I guess most of my French music collection would fit there, a lot of Quebec stuff (Richard Desjardins, Marie-Jo Therio, Colocs etc) plus a huge amount of european artists classics (Brel, Brassens Ferré, Gaoinsbourg ) or contemporary (Bashung, Arthur H, Thomas Fersen, Brigitte Fontaine)
Among my boxsets i own from those artists, the most outlandish one is probably this one
A huge candy box (reference to the song Les Bonbons) in which a bunch of cds are put inside. Man it takes place.
Also, i have a thing for french yé yé songs of the sixties and the early 70s