The term 'Sing Like a Canary' refers to the act of singing in a high-pitched, melodic voice. The two crossword solutions for this term are 'WARBLE' (6 letters) and 'TWEET' (5 letters). Warbling is a type of singing that is characterized by a series of trills or vibratos, while tweeting is a type of singing that is characterized by short, high-pitched notes. Both warbling and tweeting are commonly associated with birds, particularly canaries, which is why the phrase 'Sing Like a Canary' is used to describe these types of singing.