How to write birthday song in English?

Birthday song.

birthday

English [?b?θde?] American [?b?rθde?]?

n. birthday

Plural: birthdays

noun-birthday?

the day in each year which is the same date as the one on which you were born

Happy Birthday!

Happy Birthday!

Oliver's 13th birthday

Oliver's 13th birthday

a birthday card/party/present?

Birthday card / party / present

Happy Birthday!

Extended information:

song

English [s?] American [s]?

n. song; songs; (collectively) songs; singing; vocal music; (of a bird) chirping, crowing

noun

1, [C]? song; song?

a folk/love/pop, etc. song?

Folk songs, love songs, pop songs, etc.

We sang a song together.

see also?swansong

2. [U]? (collectively) song; singing; vocal?

The story is told through song and dance.

Suddenly he burst into song (= started to sing) .

Suddenly he burst into song.

see also?plainsong

3. [U,?C]? (bird's) chirping, crowing?

the song of the blackbird

Black oriole's chirping