You see, Nurse Cuckoo had enough spare time on her hands. Her only patients were the boys from the nearby boarding school. And one does get tired of treating bruises, runny noses, projectile vomiting and what-have-you. So, to save herself from boredom, she used to moonlight as a dragon-trainer. But she did not teach the usual burn-destroy-and-pulverise type of things, which, more or less, were what the dragon-training curriculum included. No, she taught them to sing. You are probably scratching your chin in confusion by now, so I feel a little explanation is needed.
As you know, dragons are usually rich. True, they are only guardians of treasures, but a few nuggets more or less from a heap doesn’t really bring in charges of appropriation of funds from their bosses. So they do just fine for themselves. But this particular branch of dragons had tried to pull off a major embezzlement of their master’s wealth. Consequently, they were banished from their kingdom until they could refund the amount of money stolen. Reimbursing the money would not have been such a problem if there was not such a dearth in the demand for dragon-labour in the market. I mean, who, except maybe the fire-proof Hellboy, would willingly engage in their services? So they were in a bit of a soup.
Anyway, everything was going picture-perfect until, as you must be expecting by now, there arose a problem. The children of the boarding school were also participating in the talent show. And when they heard how good the dragons were, especially Fireball Timberlake, Sparky Jackson and Lady Kindle-Light Gaga, they were really tensed. But no one got their goat (metaphorically of course, goats give dragon indigestion!) more than the new dragon-kid on the block, Combusting Bieber. He could even blow fire-raspberries while he sang!
When Combusting realised what the children had done to him, he was really pissed. But he had an ace up his sleeve which even his dragon-cronies did not know about. He could dance the best tango in the whole of Not-So-Far-Away Land! He never publicised the fact because, well, you know, it is not a dragony type of thing to do, unlike singing, which all dragons give in to occasionally when sad. Anyway, the talent show that day saw the best tango ever danced in the world, accompanied by a dragon-version of Dancing Queen!