Nearly wherever we might travel we will be rewarded with singing birds. Bird song is a series of notes that are repeated in more or less the same sequence. It is generally under the control of male hormones and is concerned with the breeding cycle. For many birds, song has little to do with joy and a lot to do with aggressiveness - in short, song is a substitute for territory defense.
Birds sing most vigorously in spring and males without mates are the most vigorous singers.
Once the activities of raising a family get under way, singing by males begins to wane. In British Columbia, singing is at its peak in May and June. Following the breeding season many birds begin to molt feathers and they fall silent at this time. Dawn is when most birds sing the loudest and most often. Singing tapers off through the day until evening when it begins once more.