Common chiffchaff one of the first avian signs that spring has returned. Its call is a "hweet", less disyllabic than the "hooeet" of the willow warbler or "hu-it" of the western Bonelli's warbler. The song differs from that of the Iberian chiffchaff, which has a shorter . However, mixed singers occur in the hybridisation zone and elsewhere, and can be difficult to allocate to species. When not singing, the common chiffchaff can be difficult to distinguish from other leaf warblers with greenish upperparts and whitish underparts, particularly the willow warbler. However, that species has a longer primary projection, a sleeker, brighter appearance
Does Humor Belong in Music? (video) A laserdisc version was also released in Japan, complete with Japanese subtitles for all spoken and sung material and featuring a slightly different audio mix than the VHS and DVD versions. This laserdisc version was available as a bootleg DVD from both the "Digital Underground" label (no association with the rap group of the same name) and the "Room 101" bootleg label, released a year or so before the official EMI DVD. Does Humor Belong in Music? (video) Does Humor Belong in Music? is a one-hour Frank Zappa concert video composed of live performances at The Pier in New York