Bird vocalization includes both bird calls and bird songs. In non-technical use, bird songs are the bird sounds that are melodious to the human ear.
The distinction between songs and calls is based upon complexity, length, and context. Songs are longer and more complex and are associated with courtship and mating, while calls tend to serve such functions as alarms or keeping members of a flock in contact.
Bird song is best developed in the order Passeriformes. Most songs are emitted by male rather than female birds. Song is usually delivered from prominent perches, although some species may sing when flying.
There is a total of 43 bird sounds. If you are more interested in songbirds, you can then always choose the one that fits you best such as kookaburra, skylark, blue jay and warbler. And of course, who can resist the beautiful singing birds such as nightingales, cardinals and sparrows.
There are also the sounds of predatory birds the most famous of which are owls, hawks, eagles, falcons and buzzards.
If you are more of the exotic side, then your best choice would be peacock, parrot, canary and budgies.
If you do not have all your ducks in a row and you are not satisfied with anything from the above, you can always choose flamingo, or around-the-globe famous pigeon.