Question: "Sea of Time" is an instrumental piece composed by George Martin and performed by his 41-piece orchestra for the Beatles' film "Yellow Submarine", a British animated musical fantasy comedy film inspired by the music of the Beatles, released in which year?

full_context: Document 1: Yellow Submarine (song): "Yellow Submarine" is a 1966 song by the Beatles, written by Paul McCartney and John Lennon, with lead vocals by Ringo Starr. It was included on the "Revolver" (1966) album and issued as a single, coupled with "Eleanor Rigby". The single went to number one on every major British chart, remained at number one for four weeks, and charted for 13 weeks. It won an Ivor Novello Award "for the highest certified sales of any single issued in the UK in 1966". In the US, the song peaked at number two on the "Billboard" Hot 100 chart and became the most successful Beatles song to feature Starr as lead vocalist.
Document 2: Yellow Submarine (sculpture): The Yellow Submarine in Liverpool is a large model representation of the submarine featured in the animated film "Yellow Submarine", inspired by the song of the same name on the Beatles album "Revolver". It was built by a group of about 80 apprentices from Cammell Laird's shipyard, designed in part by Mr L Pinch, a draughtsman at the yard, for exhibition at the International Garden Festival in Liverpool in 1984. The Submarine was in a garden themed around the Beatles, one of 60 such themed gardens, and was highly popular. The garden took the form of an apple-shaped labyrinth, containing symbolic references to the group, and included a bronze statue of John Lennon, which now stands at Liverpool John Lennon Airport.
Document 3: Pepperland (song): "Pepperland" is an instrumental orchestral piece conducted and composed by The Beatles' producer George Martin for the "Yellow Submarine" film and was the introduction to the orchestral Side 2 of the film's soundtrack album by The Beatles, released in 1969. The song was recorded by a 41-piece orchestra at Abbey Road Studios on 22–23 October 1968. The piece, as with the others in the film, is tailored to the vibrant visuals of the film, so contain novelty sounds, effects, and musical experimentation that are better understood when paired with these visuals for some, however these pieces of music can also be admired for their beauty on their own.
Document 4: Wonderwall Music: Wonderwall Music is the debut solo album by English musician George Harrison and the soundtrack to the 1968 film "Wonderwall", directed by Joe Massot. Released in November 1968, it was the first solo album by a member of the Beatles, and the first album to be issued on the band's Apple record label. The songs are all instrumental pieces, except for occasional non-English vocals, and mostly comprise short musical vignettes. Following his Indian-styled compositions for the Beatles since 1966, he used the film score project to further promote Indian classical music by introducing rock audiences to instruments that were relatively little-known in the West – including shehnai, sarod, tar shehnai and santoor. The Indian pieces are contrasted by Western musical selections, in the psychedelic rock, experimental, country and ragtime styles.
Document 5: Sea of Time: "Sea of Time" is an instrumental piece composed by George Martin and performed by his 41-piece orchestra for the Beatles' film "Yellow Submarine" and was included on the orchestral Side 2 of its soundtrack album. The piece is significant among the orchestral tracks, as it features Indian classical instrumentation. It opens with a tampura drone and a winding melody similar to that of George Harrison's "Within You Without You", from the Beatles' 1967 album "Sgt. Pepper's Lonely Hearts Club Band".
Document 6: It's All Too Much: "It's All Too Much" is a song by the English rock group the Beatles from their 1969 album "Yellow Submarine". Written by George Harrison in 1967, it reflects the ideological themes of that year's Summer of Love. The Beatles recorded the track in May 1967, shortly after completing their album "Sgt. Pepper's Lonely Hearts Club Band". It was one of four new songs they then supplied for the 1968 animated film "Yellow Submarine", to meet their contractual obligations to United Artists.
Document 7: Yellow Submarine (film): Yellow Submarine (also known as The Beatles: Yellow Submarine) is a 1968 British animated musical fantasy comedy film inspired by the music of the Beatles, directed by animation producer George Dunning, and produced by United Artists and King Features Syndicate. Initial press reports stated that the Beatles themselves would provide their own character voices; however, aside from composing and performing the songs, the real Beatles participated only in the closing scene of the film, while their cartoon counterparts were voiced by other actors.
Document 8: Ringo Starr filmography: In addition to the Beatles' films "A Hard Day's Night" (1964), "Help!" (1965), "Magical Mystery Tour" (1967), "Yellow Submarine" (1968) and "Let It Be" (1970), Ringo Starr also acted in films such as "Candy" (1968), "The Magic Christian" (1969, alongside Peter Sellers), "Blindman" (1971), "Son of Dracula" (1974) and "Caveman" (1981).
Document 9: George Harrison: George Harrison, {'1': ", '2': ", '3': ", '4': "} (25 February 1943 – 29 November 2001) was an English guitarist, singer-songwriter, and producer who achieved international fame as the lead guitarist of the Beatles. Often referred to as "the quiet Beatle", Harrison embraced Hinduism and helped broaden the horizons of his fellow bandmates as well as their American audience by incorporating Indian instrumentation in their music. Although most of the Beatles' songs were written by John Lennon and Paul McCartney, most Beatles albums from 1965 onwards contained at least two Harrison compositions. His songs for the group included "Taxman", "Within You Without You", "While My Guitar Gently Weeps", "Here Comes the Sun" and "Something", the last of which became the Beatles' second-most covered song.
Document 10: Within You Without You: "Within You Without You" is a song written by George Harrison and released on the Beatles' 1967 album "Sgt. Pepper's Lonely Hearts Club Band". It was Harrison's second composition in the Indian classical style, after "Love You To", and was inspired by his six-week stay in India with his mentor and sitar teacher, Ravi Shankar, over September–October 1966. Recorded in London without the other Beatles, the song features Indian instrumentation such as sitar, dilruba and tabla, and was performed by Harrison and members of the Asian Music Circle. The recording marked a significant departure from the Beatles' previous work; musically, it evokes the Indian devotional tradition, while the overtly spiritual quality of the lyrics reflects Harrison's absorption in Hindu philosophy and the teachings of the Vedas. Although the song was his only composition on "Sgt. Pepper", Harrison's endorsement of Indian culture was further reflected in the inclusion of yogis such as Paramahansa Yogananda among the crowd depicted on the album cover.
Document 11: George Dunning: George Garnett Dunning (November 17, 1920 – February 15, 1979) was a Canadian-born filmmaker and animator. He is best known for animating and directing the 1968 Beatles film "Yellow Submarine".
Document 12: Pepperland Laid Waste: "Pepperland Laid Waste" is an instrumental orchestral piece conducted and composed by The Beatles' producer George Martin for the "Yellow Submarine" film and was the sixth track on the orchestral Side 2 of the film's soundtrack album by The Beatles, released in 1969.
Document 13: Yellow Submarine (album): Yellow Submarine is the tenth studio album by English rock band the Beatles, released on 13 January 1969 in the United States and on 17 January 1969 in the United Kingdom. It was issued as the soundtrack to the animated film of the same name, which premiered in London in July 1968. The album contains six songs by the Beatles, including four new songs and the previously released "Yellow Submarine" (1966) and "All You Need Is Love" (1967). The remainder of the album was a re-recording of the film's orchestral soundtrack by the band's producer, George Martin.
Document 14: March of the Meanies: "March of the Meanies" is an instrumental orchestral piece conducted and composed by The Beatles' producer George Martin for the "Yellow Submarine" film and was the fifth track on the orchestral Side 2 of the film's soundtrack album by The Beatles, released in 1969. The song was recorded by a 41-piece orchestra at Abbey Road Studios on 22–23 October 1968. The melody is built on an insistent rhythm, driven initially by a marimba, over which strings and brass are given strident melodic passages.
Document 15: Ringo's Yellow Submarine: Ringo's Yellow Submarine is a former 60-minute weekly radio show hosted by Ringo Starr, airing on the ABC Radio Network, starting from June 4, 1983, with the last show airing on November 26, 1983. The first 25 shows featured different songs, either from the Beatles days or solo days, with occasional stories from Ringo himself about one of the songs or about being a Beatle, with the 26th and final show being a call-in show.
ground_truth: 1968