Siberian chiffchaff to be a full species due to its distinctive plumage and vocalisations, being similar to "P. s. sindianus" in these respects. Common chiffchaffs (of the nominate race) and Siberian chiffchaffs do not recognize each other's songs. Pending resolution of the status of the form "fulvescens", which is found where the ranges of common chiffchaff (of the race "abietinus") and Siberian chiffchaff connect and may or may not be a hybrid between these, "tristis" is maintained in "P. collybita" by most checklists. Siberian chiffchaff Siberian chiffchaff ("Phylloscopus (collybita) tristis") is a leaf-warbler which is usually considered a subspecies of the common
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