I've been to the occasional themed session and quite enjoyed it. It does us no harm to be nudged out of our comfort zone a bit, if only to introduce a bit of variety.

Of course it you're really stubborn you can sing one of your usual songs and contort the theme to fit it, but I think many people enjoy the challenge of seeking out something they might not otherwise have sung. And at least if you do that, no one's going to say, "What in heaven's name did she choose that song for? It really doesn't suit her!" On the plus side, you may even find a song or type of song that you hadn't tried before and find that it suits you better than you expected.

Marje