There’s a video on YouTube of Lalah Hathaway singing with the jazz and funk collective Snarky Puppy. Now, at first, the video seems pretty ordinary, badass singer singing with badass band, but then ...

This woman can make the sound of two notes at once. She makes it seem so easy, you'd think it'd be something she learned as a party trick. But the singer, Anna-Maria Hefele, has been doing this ...