Let's see what we have in store?

Loads of French.

Intro to Do U Lie? by a to me unknown child.
French seduction on Girls And Boys by Mary France.

Only Dutch by his then Dutch girlfriend on the unreleased longer version of The Dopamine Rush.

Loads of Spanish by way of ex-wife Mayte.
Intro to P Control.

Some Portugese on Emancipation.
What song again? Get Your Groove On? A guy and a girl.

Italian on an interlude after What Do U Want Me 2 Do? on Musicology.

The only German I know is spoken by Jill Jones[?] on the demo version of All Day, All Night.

Common y'all, let's play this game!

I am sure there's loads more...

GooeyTheHamster said:

I always thought he sang some kind of Japanese or chinese on Strange relationship

Japanese in Partyman video at the end

まだ終わりじゃないよ which means "This ain't over yet..."

Also all of the Japanese snippets on his clothes from Batman onward,like

ふたご座 Gemini
ヌード Nude
ミネアポリス　Minneapolis

Other Japanese snippets may come to mind...

I can't remember exactly but it sounded like a little snippet of german on the Sadomasochistisist (sic) Groove on Slaughterhouse after he says "this is for the foreigners".

And we've got some French interpretation in Le Grind: "Ce soir, la chante (all night long...)

Endorphinmachine:
Prince esta muerto (prince is dead)
Prince esta muerto (prince is dead)
Que viva para siempre el poder de la nueva generacion
(long live the new power generation)
Get Wild:
Ououo, peligro que aqui yo vengo! (oh oh, danger 4 here I come!)