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?

Context paragraphs:
The Beatles discography: In their native United Kingdom, during 1962–1970, the Beatles released 12 studio albums, 13 extended plays (EPs) and 22 singles.  However, the band's international discography is complicated, due to different versions of their albums sometimes being released in other countries, particularly during their early years on Capitol Records in North America.  The Beatles' discography was originally released on the vinyl format, with full-length long plays (LPs), shorter EPs and singles.  Over the years, the collection has also been released on cassette, 8-track, compact disc (CD), and on a USB flash drive in MP3 and 24-bit FLAC format.  Although their output has come to include vault items and remixed mash-ups, the Beatles' "core catalogue", recorded in 1962–1970, is 217 songs totalling approximately 10 hours of music.  Additionally, they released five tracks that are different versions of previously released songs: "Love Me Do", "Revolution", "Get Back", "Across the Universe" and "Let It Be"; two tracks in German: "Komm, Gib Mir Deine Hand" and "Sie Liebt Dich"; and two tracks that are duplicates of songs included on previous albums but also included on the album "Yellow Submarine": "Yellow Submarine" and "All You Need Is Love".

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.

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".

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.

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.

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.

A Beginning: "A Beginning" is an instrumental piece composed by the Beatles' producer George Martin and intended as an introduction to "Don't Pass Me By", Ringo Starr's first solo composition from the Beatles' 1968 double album "The Beatles" (also known as the "White Album").

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.

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.

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.

Supporting paragraphs: Sea of Time Yellow Submarine (film)
Answer: 1968