Put it in your pocket for a rainy day
Sing your song and you know you're wrong now [repeated*]
I don't know why I can't think of a line [repeated*]
Yesterday I found a day
I know today I lost a day [repeated*]
* these first three parts repeated over one another
[Steve's French/Japanese sounding rap]
I know much more Japanese than French, but in my country French is everywhere so I can recognise it. Without a doubt, the rap is in French. I've seen a couple pages say Japanese too, but it really doesn't sound like it at all. He is speaking odd French though, I believe it's very slang-y.