Common swift that resemble a crescent or a boomerang. Their call is a loud scream in two different tone pitches, the higher of which issues from the female. They often form 'screaming parties' during summer evenings, when 10–20 swifts will gather in flight around their nesting area, calling out and being answered by nesting swifts. Larger "screaming parties" are formed at higher altitudes, especially late in the breeding season. The purpose of these parties is uncertain, but may include ascending to sleep on the wing, while still breeding adults tend to spend the night in the nest. Swifts may nest in former
Screaming (music) metal to death metal. Black metal music in particular has a definitive "screaming" style which constitutes a vast majority of the genre's vocal work, though this is done in varying degrees. Some black metal acts use this approach as a simple rasping sound, but others use a louder, more "grim" scream to emulate the cold, evil, and frightening atmosphere black metal would portray. Vocalists like Ihsahn of Emperor, Grutle Kjellson of Enslaved and Pest of Gorgoroth use loud screaming in their vocal work, while other vocalists take differing approaches; for example: Shagrath of Dimmu Borgir once used a style on