Catherynne M. Valente’s 2018 Space Opera is a standalone space opera.
In the not too distant future, humanity finds itself invited into the Warm Fuzzy Galactic Family, an interstellar community of beings who agree to recognize each others’ personhood. There are a couple of tiny catches: membership is not automatic and failing the test will result in the total extermination of the human race. Also, the test is mandatory.
The good news is that the test is fairly straightforward: participate in the Metagalactic Grand Prix, a galaxy-wide musical contest. Humanity’s champions don’t even have to win, just avoid coming in dead last. The aliens are even kind enough to provide a list of musicians they feel have a chance of not abjectly losing. It’s too bad that everyone on that list is dead.
Well, not quite everyone.