Meet Sydney, a male umbrella cockatoo socializing with Vet Hospital Staff

Cockatoos especially are extremely musically inclined birds and will readily dance and sing along to catchy tunes. That breed in particular will recruit others to sing along and the more people or birds or whoever (they don't care) join in, the more excited the bird gets.

Now, they're not betrothed to him and it's not exactly a mating dance (though co-musician birds have been known to stay together and raise bird families), the bird will be more drawn to these people because he knows they'll participate in his performances. He'll go out of his way to spend time with them and wild ones will even visit homes of previous friends!

Folks have reported that cockatoos who they've interacted with in the wild have indeed shown up at their homes for encore performances. Even more amazing is that the bird tends to bring his friends with him! He'll somehow recruit every local musical bird or insect and bring them along. Sometimes, somehow the bird and his cohort even bring people along with them, hypnotized and convinced to participate by the incredible dancing animals. A person who dances with a Cockatoo even once can absolutely expect to wake up to a yard full of dancing birds and animals and even some entranced people from time to time. It's just a thing that happens and it's fine.