The male is able to sing two notes at once, which gives its song an ethereal, flute-like quality. Each individual bird has its own repertoire based on combinations of variations of the three parts. Songs are often repeated in order. The "bup, bup, bup" phrase is also sometimes used as a call, which is louder and at a greater frequency when the bird is agitated. The wood thrush also use a "tut, tut" to signal agitation. The nocturnal flight call is an emphatic buzzing "heeh."