Who is this "Lady Gaga" you speak of?

I don't live under a rock and thus have heard of Lady Gaga—even heard a song or two without identifying her as the artist.

But I've never really listened to her music or learned much about her, so when I came across an interview while channel flipping I gave it a chance, and...I might change my mind later, but I think I'm impressed with her.

At the very least, quite a fascinating subject.