The Indigo Bunting sings a loud song from a prominent perch. Its song often consists of several sets of phrases, the last phrase often dropping in pitch: swee, swee, swee, ches, ches, ches.
At Breeches it is not as popular as other birds such as finches, so if you find it, most likely in June and July, make a note of it in your notebook (10 B-points). If you manage to take a photo of this gorgeous fellow, you will get 30 B-points towards your B-award.