IPA: /ˈdɪti/
KK: /ˈdɪti/
A short and simple song, often with a catchy tune.
She sang a cheerful ditty while walking in the park.
Ditty originates from the Middle English 'ditie', which comes from the Old French 'dite', meaning a song or poem. The word refers to a short, simple song or poem.
Think of a 'song' ('dite') that is short and simple — that's what a ditty is.