Note of a robin or lark

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Tirralirra \Tir"ra*lir`ra\, n. A verbal imitation of a musical sound, as of the note of a lark or a horn. The lark, that tirra lyra chants. --Shak. ``Tirralira, '' by the river, Sang Sir Lancelot. --Tennyson.

Wiktionary Word definitions in Wiktionary
interj. (non-gloss definition: A verbal imitation of a musical sound, as of the note of a lark or a horn.)