Kaurismäki and music
I love the way Kaurismäki's films are randomly infused with interesting songs. His films are often bleak, but just when things are at their bleakest point, up pops a cool song (most often sung by a popular Finnish singer), either in a bar, inside a store, on a jukebox, or playing on someone's radio or stereo, etc. Love how he incorporates music in his movies!