HQ Sings too y'know!

We get to hear Harley Quinn Sing a few different times in her existence.

I personally prefer one of the first times I did hear her sing almost a full song. It turned into one of my favorite songs.

But then there's this small clip that was included at the end of  the Batman Arkham City video game. It has a much darker feel in the tone than what I'm used to seeing the love dove having. But then again, from what I understand the games aren't all peaches and cream. So hear ya go for comparison.

What do ya think? I kinda like her happier more...character correct toning in the sweethearts song. But maybe there's a reason that it has such a darkly edged tone to it. Who knows.