"Danny Boy" is a ballad set on the Irish melody "Londonderry Air," with lyrics written by Frederic Weatherly in 1910. In The Amazing World of Gumball, the ballad is sung by Patrick in "The Date," although he is repeatedly interrupted, mostly by Gumball.
Patrick: Oh, Danny boy
The pipes, the pipes— [interrupted]
From glen to glen— [interrupted]
But come ye back
When Summer's in the meadow
Or when the valley's— [interrupted]
And white with snow