Question: Who sang "It's the Most Wonderful Time of the Year" first, Johnny Mathis or Andy Williams?

Context paragraphs:
Love Is Everything (Johnny Mathis album): Love Is Everything is an album by American pop singer Johnny Mathis that was released by Mercury Records on March 5, 1965, and included covers of hit songs from the 1930s ("Dancing in the Dark"), 1940s ("Long Ago (and Far Away)"), 1950s ("An Affair to Remember (Our Love Affair)" and "Never Let Me Go") and 1960s ("Go Away Little Girl", "People", and "This Is All I Ask") as well as new songs from the composers of "Fly Me to the Moon" ("A Thousand Blue Bubbles"), "What Will Mary Say" ("One More Mountain"), and "It's the Most Wonderful Time of the Year" ("Love Is Everything").

The Best of Johnny Mathis 1975–1980: The Best of Johnny Mathis 1975–1980 is a compilation album by American pop singer Johnny Mathis that was released in the fall of 1980 by Columbia Records.  This collection is similar to his last major compilation, 1972's "Johnny Mathis' All-Time Greatest Hits", in that it excludes many of his American radio hits of this period ("Arianne", "Begin the Beguine", "Do Me Wrong, but Do Me", "Loving You-Losing You", "One Day in Your Life", "Stardust", "Yellow Roses on Her Gown", and "You're All I Need to Get By", all of which made the Adult Contemporary chart in "Billboard"

Love Story (Johnny Mathis album): Love Story is an album by American pop singer Johnny Mathis that was released in February 1971 by Columbia Records and included a recent Oscar nominee ("What Are You Doing the Rest of Your Life? "), a flashback to 1967 ("Traces"), a new song by Bacharach & David ("Ten Times Forever More"), a lesser-known one by Goffin & King ("I Was There"), and two songs that originated in film scores from 1970 and had lyrics added later: the album closer, "Loss of Love", from "Sunflower" and the album opener from "Love Story", which was subtitled "Where Do I Begin".  The norm for Mathis projects from this era was to cover recent hits, and the title track of this one was so recent that the version by Andy Williams began a 13-week run to number nine on "Billboard" magazine's Hot 100 chart in February 1971, coinciding with the release of this LP.

Johnny Mathis: Wonderful, Wonderful!: Johnny Mathis: Wonderful, Wonderful!  is a television concert by American pop singer Johnny Mathis that was recorded on October 27, 2006, at the Tropicana Hotel in Atlantic City and aired that December on most PBS stations.  In addition to singing some of his biggest hits, he covers tracks from his live albums ("In the Morning" from "" and "To the Ends of the Earth" from "Unforgettable – A Musical Tribute to Nat King Cole"), songs from Brazil ("Manhã de Carnaval" from "Olé" and "Brazil (Aquarela do Brasil)" from "The Ultimate Hits Collection"), and two exclusives ("Let Go (Canto de ossanho)" and "Pure Imagination") that have never appeared on a Mathis album.  Interview clips with Mathis were inserted at intervals throughout the concert along with live performance excerpts from programs such as "The Tonight Show Starring Johnny Carson" and "The Andy Williams Show".

Moon River: The Very Best of Andy Williams: Moon River: The Very Best of Andy Williams is a compilation album by American pop singer Andy Williams that was released on October 13, 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 Viking/Penguin.  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."  The collection covers a wide assortment of his material, including crossover hits ("Can't Get Used to Losing You" and "(Where Do I Begin) Love Story"), stabs at the youth market ("Butterfly" and "Music to Watch Girls By"), a pair of Mancini-Mercer Oscar winners ("Days of Wine and Roses" and "Moon River"), a Christmas classic ("It's the Most Wonderful Time of the Year"), and a eulogy to the late Robert F. Kennedy ("Battle Hymn of the Republic").

The Complete Christmas Collection 1958–2010: The Complete Christmas Collection 1958–2010 is a three-disc box set by American pop singer Johnny Mathis that was released in 2015 by Real Gone Music under license from Columbia Records.  The set includes Mathis's five holiday albums from the period in their entirety: "Merry Christmas", "Sounds of Christmas", "Give Me Your Love for Christmas", "Christmas Eve with Johnny Mathis", and "The Christmas Album".  It also compiles all of Mathis's holiday songs that were only released as singles, as well as thematically-appropriate tracks from his non-holiday albums: "When a Child Is Born" from "I Only Have Eyes for You", the holiday version of "What a Wonderful World" from "Let It Be Me", and his two recordings of "Ave Maria" from "Good Night, Dear Lord", which bookend the set.

The Andy Williams Christmas Album: The Andy Williams Christmas Album is the first Christmas holiday album released by singer Andy Williams.  It was issued by Columbia Records in 1963, and it would prove to be the first of eight Christmas albums released by Williams.  Though it was also the album that introduced Williams' perennial holiday classic "It's the Most Wonderful Time of the Year", Columbia instead opted to release Williams' cover of "White Christmas" as the album's promotional single at the time.

It's the Most Wonderful Time of the Year: "It's the Most Wonderful Time of the Year" is a popular Christmas song written in triple time in 1963 by Edward Pola and George Wyle.  It was recorded and released that year by pop singer Andy Williams for his first Christmas album, "The Andy Williams Christmas Album".  However, the song was not released as a promotional single by Williams' record label (Columbia Records) that year, as they instead opted to promote his cover of "White Christmas" as the official promo single from the album.

We Need a Little Christmas (album): We Need a Little Christmas is a Christmas album by American pop singer Andy Williams that was released by Unison Music in 1995.  It gives an adult contemporary treatment to songs that Williams had previously recorded for 1963's "The Andy Williams Christmas Album" ("Away In A Manger", "The Christmas Song (Chestnuts Roasting On An Open Fire)", "It's The Most Wonderful Time Of The Year", "Silent Night"), 1965's "Merry Christmas" ("Mary's Little Boy Child"), 1974's "Christmas Present" ("Angels We Have Heard On High", "Hark!  The Herald Angels Sing", "I Heard the Bells on Christmas Day", "What Child Is This"), and 1990's "I Still Believe in Santa Claus" ("I'll Be Home for Christmas") and includes three songs that Williams had not recorded before.  In a brief note on the back of the jewel case Williams writes, "These all-new recordings feature fresh, innovative arrangements of some of my favorite carols.  I felt like I was singing them for the very first time."

You've Got a Friend (Johnny Mathis album): You've Got a Friend is an album by American pop singer Johnny Mathis that was released on August 11, 1971, by Columbia Records.  The phrase "Today's Great Hits" can be found above the title on both sides of the record jacket as well as both sides of the LP label as if to emphasize that this is essentially an album covering songs that were recently on the charts.  This was a common practice of many vocalists of the period, so much so in fact that fellow Columbia artist Andy Williams also released an album titled "You've Got a Friend" in August 1971 on which he coincidentally covers seven of the 11 tracks that Mathis recorded for this album.

Supporting paragraphs: Love Is Everything (Johnny Mathis album) It's the Most Wonderful Time of the Year
Answer: Andy Williams