I think it may have been a valid reason to the person that complained and Customer Care, if not to you. The reason why is no one else had the background info that you did in your mind; you knew they where all singers and that by listing 3 similar people you where attempting to indicate a comparison, but this is VERY vague to someone who doesnt know what you where thinking when you wrote it. Three names; who the heck are these people? Question mark; what does he want to know??? \n\nNo offence, but I am sure I would have reported it as not a question or at least posted a response asking you to elaborate as well. The way to avoid this type of response from others it to take the time to ask a full question with detail...think of a quiz for school where they simply list three  names of historic figures followed by a question mark...would you know that your teacher wanted you to compare their effect on the civilized world as it is today, with no other information, or would you fail miserably? My point is, do as you did with this question; fill the reader in on all the important parts they need to come up with a good answer for you. Read it again before you post it to see if it will make sense to others.\n\nHope this helps to clarify the situation. Good luck with all your future questions!