"Because" is a ballad written by John Lennon (credited to Lennon/McCartney) and performed by The Beatles. It features a 3-part harmony vocal performance between Lennon, McCartney and George Harrison, overdubbed three times to make nine voices in all. The results of this have been compared in sound to the Beach Boys. It appeared on the 1969 album Abbey Road, and is the song that precedes the extended medley that formed side two of the original LP record.

The story has been told that this song is actually "Moonlight Sonata" by Ludwig van Beethoven played backwards. While this is not precisely true, "Moonlight Sonata" certainly served as an inspiration for the song. "Yoko was playing Beethoven's 'Moonlight Sonata' on the piano ... I said, 'Can you play those chords backwards?', and wrote 'Because' around them. The lyrics speak for themselves ... No imagery, no obscure references."

The song begins with electric harpsichord played by George Martin and then joined by Lennon's guitar doubling the harpsichord and played through a Leslie speaker. Vocals and bass guitar enter in what Alan Pollack calls the "mini-bridge."

The song was one of the few Beatles songs to include an analog synthesizer arrangement (although analog keyboards such as the Mellotron had been used often by The Beatles, few songs featured the use of a traditional analog synthesizer with voltage-controlled oscillators). The Beatles at the time of Abbey Road were among the first contemporary rock bands to experiment with the Moog synthesizer.

The main recording session for "Because" was on 1 August 1969, with vocal overdubs on 4 August, and a Moog synthesizer overdub by George Harrison on 5 August. As a result, this was the last song on the album to be committed to tape, although there were still overdubs for other incomplete songs.

A vocals-only version of the song can be found on Anthology 3 and Love and is an example of three part harmony from Lennon, McCartney, and Harrison.

"Because" is a song with music by Guy d'Hardelot and lyrics by Edward Teschemacher, originally published in 1902.

A recording made on December 2, 1947 was a hit for Perry Como in the spring of 1948. It was released on singles as follows:

• In the United States, by RCA Victor Records, as a 78rpm record (catalog number 20-2653-A) with the flip side "If You Had All the World and Its Gold." This single was released in 1949 as a 45rpm record (catalog number 47-2728).
• Also in the US, by RCA Victor, as a 78rpm record (catalog number 20-3299-A), with the flip side a re-release of "Till the End of Time." This single was released in 1949 as a 45rpm record (catalog number 47-2887).
• In the United Kingdom, by HMV, as a 78rpm single (catalog BD-1215), in October, 1948. The flip side was "It Only Happens When I Dance with You."

The Como recording first entered the U.S. charts on March 13, 1948 and ultimately reached No. 4 on the chart.