From an artistic standpoint? Sure. No reason not to include a question mark!
From a technical standpoint? Eh... maybe not? Question marks are one of those special characters that may or may not be handled coherently by all computer systems that may incorporate your song. if the song gets any traction, it could result in some hassles with royalty payments or chart reporting etc. (Tho, all in all that's kind of a long shot of a thing to be worried about)