“Clap along if you feel/ Like a room without a roof”?
Rooms don’t really have roofs; they have ceilings. Furthermore, even if you replace the word “roof” with the word “ceiling”, isn’t that rather problematic? Seeing as a room is really incomplete without a ceiling.
So if you feel like a room without a roof, you are likely to be UNhappy, rather than happy. I should think.