Pale crag martin to do so, it would cast doubts on their specific distinctness. There are several subspecies differing in plumage shade or size, although the differences are clinal, and races interbreed where their ranges meet. The pale crag martin of the nominate subspecies "P. o. obsoleta" is 12–13 cm (4.7–5.1 in) long with light brown upperparts, becoming paler on the lower back, and a short square tail that has small white patches near the tips of all but the central and outermost pairs of feathers. It has a pale grey throat, upper breast and underwing coverts, and the rest of the underparts
A Whiter Shade of Pale by the song's co-authors Gary Brooker, Keith Reid and Matthew Fisher – "A Whiter Shade of Pale" reached number 1 in several countries when released in 1967. In the years since, it has become an enduring classic. It was the most played song in the last 75 years in public places in the UK (as of 2009), and the United Kingdom performing rights group Phonographic Performance Limited in 2004 recognised it as the most-played record by British broadcasting of the past 70 years. Also in 2004, "Rolling Stone" placed "A Whiter Shade of Pale" 57th on its list of the