Experimental is a huge heading in film, with conflicting definitions galore! I've enjoyed these titles over years, I offer their sum, both in intention and completion, as my definition. I attempted to offer only one per filmmaker, but a few times it became too difficult.
These aren't ranked. I'll probably add and subtract as I see new goodies and become tired of old choices. I can hear you talking by imaginary message: "too many Americans!" Uhh, well . . . you're right. I hope to become a Japanese or African or Latin American ciné-detective soon and track their expansive hallelujahs . . . if they let me.
Not on LB: Meer (2004), dir. Wolfgang Lehmann & Telemach Wiesinger: music: Misato Mochizuki.