Learn French: Voulez-vous poser une question au chanteur ? - Do you want to ask the singer a question?

This sentence uses subject-verb inversion, which is a formal way to ask a question. To do this, you simply swap the verb (voulez) and the subject pronoun (vous) and join them with a hyphen.

Why is the verb poser used here instead of demander for "to ask"?

In French, you do not "ask" a question, you "pose" it! The set phrase is always poser une question. If you say demander une question, it sounds like you are requesting that someone hand you a question.

Why does it say au chanteur instead of à le chanteur?

au is the mandatory contraction of the preposition à (to) and the masculine word for "the", le. Because you ask a question "to the" singer, à + le combines into au.

Why isn't the verb poser conjugated?

When you have two verbs back-to-back, like wanting to do something, only the first verb is conjugated. The first verb (voulez) is conjugated to match vous, and the second verb (poser) stays in its full infinitive dictionary form.