Question:  B Sides and Rarities is a compilation album by American pop singer Andy Williams that included a cover of a song originally recorded by who?

Context paragraphs:
The Impossible Dream (Andy Williams album): The Impossible Dream is a double compilation album by American pop singer Andy Williams that was released in late 1971 by Columbia Records.  Unlike his most recent compilation, "Andy Williams' Greatest Hits", this 2-LP set focused exclusively on covers of songs made famous by other artists and included four tracks ("He Ain't Heavy, He's My Brother", "The Last Time I Saw Her", "Long, Long Time", and "Someone Who Cares") that had previously only been available on his UK album titled "Love Story".  In 2003 these tracks were released on the Williams collection from Collectables Records titled "B Sides and Rarities".

Andy Williams' Greatest Hits Vol. 2: Andy Williams' Greatest Hits Vol.  2 is a compilation album by American pop singer Andy Williams that was released in June 1973 by Columbia Records.  This collection follows in the footsteps of its predecessor, "Andy Williams' Greatest Hits", in that it is not limited to his biggest and most recent hit singles, although his final two US Top 40 entries ("(Where Do I Begin) Love Story" and "Speak Softly Love (Love Theme from 'The Godfather')") were included.  It also has an album track not released as a single ("The Impossible Dream (The Quest)"), a couple of hits from his time with Cadence Records ("Lonely Street" and "The Village of St. Bernadette"), two other singles that could have been included on the first volume ("In the Arms of Love" and "Music to Watch Girls By"), and two Easy Listening chart entries that never made the "Billboard" Hot 100 ("Home Lovin' Man" and "Music from Across the Way").

May Each Day: May Each Day is a compilation album by American pop singer Andy Williams that was released in the UK in early 1966 by the CBS Records division of Columbia.  A similar collection titled "Andy Williams' Newest Hits" had the same cover photo and design, but there were only five songs that they had in common.  Whereas that release focused exclusively on Columbia recordings, "May Each Day" also included songs that Williams cut during his time with Cadence Records, and while several of the tracks here were chart hits in the US, only the title track reached the singles chart in the UK.

Greatest Hits (Andy Williams album): Greatest Hits is a live/compilation album by American pop singer Andy Williams that was digitally recorded live in concert at the Andy Williams Moon River Theater in Branson, Missouri and released by the LaserLight division of Delta Music Inc. in 1994.  It includes performances of songs that he had previously recorded during his time with the Cadence and Columbia labels as well as one he had never recorded before -- "L-O-V-E", which Nat King Cole took to number 81 pop and number 17 Easy Listening in "Billboard" magazine in 1964.

The Essential Andy Williams: The Essential Andy Williams is a compilation album by American pop singer Andy Williams that was released in the UK by Sony Music Entertainment in 2002.  The label also released a two-CD compilation with the same title in the U.S. in 2002 that had a different cover photo and track listing.

Andy Williams' Greatest Hits: Andy Williams' Greatest Hits is a compilation album by American pop singer Andy Williams that was released in early 1970 by Columbia Records.  It was not, however, as its title might suggest, strictly a hit singles compilation, although some of his biggest songs since joining Columbia (such as the easy listening number ones "Can't Get Used to Losing You" and "Happy Heart") were included.  A couple of selections ("Born Free" and "More") were never released as singles by Williams, and his signature song, "Moon River", was released in the 7-inch single format but only for jukeboxes.  His six Cadence singles that made the Top 10 on "Billboard" magazine's Hot 100 are passed over for the inclusion of his number 11 hit from that label, "The Hawaiian Wedding Song", and 17 of his Columbia recordings that made the Hot 100 up until 1970 are left out here in favor of "Charade", which spent its one week on the chart at number 100.

Canadian Sunset (album): Canadian Sunset is a compilation album by American pop singer Andy Williams that was released in the spring of 1965 by Columbia Records.  The cover bears the phrase "formerly titled "Andy Williams' Best"" underneath the title, suggesting that the same songs can be found here that were on that 1961 release by Cadence Records, but his number one hit "Butterfly" and its top 10 follow-up "I Like Your Kind of Love" that were included on the Cadence album were replaced on this release with the B-sides of two of the other songs here.

He Ain't Heavy, He's My Brother: "He Ain't Heavy, He's My Brother" is a popular music ballad written by Bobby Scott and Bob Russell.  Originally recorded by Kelly Gordon in 1969, the song became a worldwide hit for The Hollies later that year and again for Neil Diamond in 1970.  It has been covered by many artists in subsequent years.  The Hollies' and Rufus Wainwright's versions of the song were featured in the film "Zoolander".

The Very Best of Andy Williams (2009 album): The Very Best of Andy Williams is a compilation album by American pop singer Andy Williams that was released in the UK on October 5th, 2009.  A note from Williams inside the CD booklet explains that the album "was put together to coincide with my memoir "Moon River and Me", published by Orion Press.  It includes many of the songs that you made hits.  I truly appreciate that, and I hope you enjoy the songs we selected for this CD."  This compilation includes recordings that either charted in the UK but not in the US ("Can't Take My Eyes off You", "It's So Easy", "May Each Day") or charted much higher on the UK singles chart than they did on the "Billboard" Hot 100 in the US ("Almost There", "Can't Help Falling in Love").  It entered the UK albums chart on October 17, 2009, and reached number 10 during its six weeks there.

B Sides and Rarities (Andy Williams album): B Sides and Rarities is a compilation album by American pop singer Andy Williams that was released by Collectables Records on May 27, 2003.  Although the collection starts out with two 1947 recordings by Kay Thompson and The Williams Brothers, the rest of the material comes from his time at Columbia Records and includes covers of contemporary hits ("Cherish", "If You Could Read My Mind", "He Ain't Heavy, He's My Brother") as well as lesser-known material from the songwriters of "Can't Get Used to Losing You", "Home Lovin' Man", and "Moon River".

Supporting paragraphs: B Sides and Rarities (Andy Williams album) He Ain't Heavy, He's My Brother
Answer: Kelly Gordon