What's Japanese for heart?

On my top 10 list of things I want to do is karaoke singing. I'd probably take it all too seriously, but still -- I'd love to try. Tonight, some of my Minimeet friends are going to do it in a place quite close by here in Amsterdam. And I really, really, want to go. But I can't. Hello, deadline. You know, any normal person would tell their publisher 'look, I need more time' - but no, I'm embarrassed to and have to at least try and make it.