1) Note of a robin or lark 
• (n.) A verbal imitation of a musical sound, as of the note of a lark or a horn.
Tir'ra·lir`ra noun 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.