Technically..... yes. Technically singing "Happy Birthday" at any venue is also considered a public performance and is subject to copyright laws. Technically. ABSURD! But nonetheless....
So don't sing popular songs in the shower loud enough for people outside to hear. Yeah.... Technically.
Stupid, isn't it? We have some really screwed up laws. But technically there are laws that prohibit sex in anything other than missionary position. So who the hell enforces these????
And.... yes, if they could figure out how to Neuralize us after a movie so we'd forget and pay to see it again.... they would.