"Norwegian Wood (This Bird Has Flown)" is a song by the English rock band the Beatles from their 1965 album Rubber Soul. It was written mainly by John Lennon and credited to the Lennon–McCartney songwriting partnership. Influenced by the introspective lyrics of Bob Dylan, the song is considered a milestone in the Beatles' development as songwriters. The track features a sitar part, played by lead guitarist George Harrison, that marked the first appearance of the Indian string instrument on a Western rock recording. The song was a number 1 hit in Australia when released on a single there in 1966, coupled with "Nowhere Man".

Lennon wrote the song as a veiled account of an extramarital affair he had in London. When recording the track, Harrison chose to add a sitar part after becoming interested in the instrument's exotic sound while on the set of the Beatles' film Help!, in early 1965. Further to several British bands, including the Beatles, using guitars to imitate the drone and other musical textures of the sitar in their recordings, "Norwegian Wood" was influential in the development of raga rock andpsychedelic rock during the mid 1960s. The song also helped elevate Ravi Shankar and Indian classical music to mainstream popularity in the West. Many other rock and pop artists, including the Byrds, the Rolling Stones and Donovan, began integrating elements of the genre into their musical approach. "Norwegian Wood" is also recognised as a key work in the early evolution of world music.

Taken from https://en.wikipedia.org/wiki/Norwegian_Wood_(This_Bird_Has_Flown)