European green woodpecker though the latter is smaller and more slender with narrower wings and longer tail. The closely related, very similar Levaillant's woodpecker occurs only in north-west Africa. The European green woodpecker is a member of the order Piciformes, the woodpecker family Picidae and the genus Picus. It was first described by Linnaeus in 1758. The scientific name is derived from the Greek "pikos", meaning 'woodpecker', and Latin "viridis", 'green'. There are four subspecies, with subtle and mostly clinal differences between them. In a recent study based on mitochondrial DNA analysis of subspecies by Perktaş, Barrowclough and Groth, it has been proposed
English folk music and therefore unworthy of attention. Some authors, however, find these distinctions more difficult to maintain. Although erotic songs became part of the standard fare in folk clubs and among folk rock musicians, relatively few of the more explicit songs have been placed on record. The hornpipe is a style of dance music thought to have taken its name from an English reed instrument by at least the 17th century. In the mid-18th century it changed from 3/2 time to 2/2, assuming its modern character, and probably reaching the height of its popularity as it became a staple of theatrical performances.