Some people have such thin hair that is impossible for them to style it, while others apparently face a bigger problem: it’s invisible and you can see the eyebrows underneath.
A selfie stick has not many uses other than holding your phone or camera to take a picture, so it’s quite hilarious that they got even that idea all wrong. And it’s an ad for it.
I’m not a musician and have no notion of how you play an instrument, but I’m pretty sure that holding it must be a key factor to make it sound. But they are the musicians after all.