Might be a darker version of The Judge's song from Gilbert & Sullivan's Trial By Jury.

The Judge's Song

The penultimate line "Hey ding a ding I love the spring when the pretty birds sing so gaily" might be referencing Shakespeare's song It Was A Lover And His Lass from As You Like It:

It was a lover and his lass,
With a hey, and a ho, and a hey-nonny-no,
That o'er the green cornfield did pass
In springtime, the only pretty ring time,
When birds do sing, Hey ding a ding, ding.
Sweet lovers love the spring.

LFF