It's a song by the British rock band The Beatles from the 1967 album. Written by lead guitarist George Harrison, in classical Indian style, and inspired by his stay in India in late 1966 with his sitar mentor and teacher Ravi Shankar.
This beautiful and melodious song was recorded in London, it features Indian instrumentation such as the sitar, tambura, dilruba and tabla, and is performed by Harrison and members of the Asian Music Circle. The record marked a significant change, from the work of The Beatles; music, it evokes Indian devotional traditions, while the overt spiritual quality of the lyrics reflects Harrison's absorption in Hindu philosophy and Vedic teachings.