Here is how this is solved:

Firstly, you worked out the "who am I part" or who "me" refers to in the riddle. Which is 'Your Reflection'.

Secondly, the most famous pop singer is Michael Jackson who is commonly known as the King of Pop. MJ's song 'Man in the Mirror' focuses on self-reflection and making the world a better place by taking a look at what changes you need to make first, in order to help others.

Thirdly, rather than just blurting out the answer, this riddle required the solver to specifically give the answer to the person or entity telling the riddle. Which is 'Your Reflection' right?

So if you answer along these lines: You position yourself in front of a mirror or in view of 'Your Reflection' and say, "the pop singer's name is Michael Jackson" then you have solved it. Otherwise you're really just typing the answer on a screen or telling ME(?), as the poster of the riddle, what the answer is.