Firstly, welcome
Secondly, Mika is not The Wiggles or Hi-5, it's worth remembering that.
Thirdly, most 5 year old children will let 'that' go completely over their heads. It would take more than that to corrupt a child of any age, in my opinion. And there are ways and means of answering any 'questions' kids may have about what they see.
Lastly, no-one is forcing you to go to a concert or take anyone with you.
But all opinions are welcome here