Question: What year does the song Gloria and the band Them have in common?

full_context: Document 1: The Who: The Who are an English rock band that formed in 1964. Their classic line-up consisted of lead singer Roger Daltrey, guitarist and singer Pete Townshend, bass guitarist John Entwistle, and drummer Keith Moon. They are considered one of the most influential rock bands of the 20th century, selling over 100 million records worldwide and holding a reputation for their live shows and studio work.
Document 2: John Wilson (drummer): John Wilson (born 3 December 1947 in Belfast, Northern Ireland) is a musician from Northern Ireland. He has had a prolific career, playing drums with bands such as Them, Taste and Stud. Previously with 'The Misfits', Wilson became a member of one of the numerous line-ups of Them from September 1965 to March 1966. Alongside Van Morrison, Alan Henderson, Jim Armstrong and Ray Elliott, Wilson played on recording sessions for Them's second album "Them Again" (released January 1966). Visa restrictions meant that he had to be substituted by stand-in drummers for initial live dates abroad, due to his youth. He was replaced by Dave Harvey upon leaving Them, and went on to work with Belfast groups 'Derek & The Sounds' and 'Cheese'.
Document 3: This Charming Man: "This Charming Man" is a song by the English rock band the Smiths, written by guitarist Johnny Marr and singer/lyricist Morrissey. It was released as the group's second single in October 1983 on the independent record label Rough Trade. The song is defined by Marr's jangle pop guitar riff and Morrissey's characteristically morose lyrics, which revolve around the recurrent Smiths themes of sexual ambiguity and lust.
Document 4: Gloria (Them song): "Gloria" is a song written by Northern Irish singer-songwriter Van Morrison and originally recorded by Morrison's band Them in 1964 and released as the B-side of "Baby, Please Don't Go". The song became a garage rock staple and a part of many rock bands' repertoires. It is particularly memorable for its "Glooooria!" chorus. It is easy to play, as a simple three-chord song, and thus is popular with those learning to play guitar.
Document 5: Brown Eyed Girl: "Brown Eyed Girl" is a song by Northern Irish singer and songwriter Van Morrison. Written by Morrison and recorded in March 1967 for Bang Records owner and producer Bert Berns, it was released as a single in June 1967 on the Bang label, peaking at No. 10 on the "Billboard" Hot 100. It featured The Sweet Inspirations singing back-up vocals and is considered to be Van Morrison's signature song. "Brown Eyed Girl" has remained a staple on classic rock radio, and has been covered by hundreds of bands over the decades.
Document 6: Them (band): Them were a Northern Irish band formed in Belfast in April 1964, most prominently known for the garage rock standard "Gloria" and launching singer Van Morrison's musical career. The original five member band consisted of Morrison, Alan Henderson, Ronnie Milling, Billy Harrison and Eric Wrixon. The group was marketed in the United States as part of the British Invasion.
Document 7: The Beatles: The Beatles were an English rock band formed in Liverpool in 1960. With members John Lennon, Paul McCartney, George Harrison and Ringo Starr, they became widely regarded as the foremost and most influential act of the rock era. Rooted in skiffle, beat and 1950s rock and roll, the Beatles later experimented with several musical styles, ranging from pop ballads and Indian music to psychedelia and hard rock, often incorporating classical elements and unconventional recording techniques in innovative ways. In 1963 their enormous popularity first emerged as "Beatlemania", and as the group's music grew in sophistication in subsequent years, led by primary songwriters Lennon and McCartney, they came to be perceived as an embodiment of the ideals shared by the counterculture of the 1960s.
Document 8: Blowin' Your Mind!: Blowin' Your Mind! is the debut album by Northern Irish musician Van Morrison, released in 1967. It was recorded 28–29 March 1967 and contained his first solo pop hit "Brown Eyed Girl". It was included by "Rolling Stone" as one of the "40 Essential Albums of 1967".
Document 9: Thin Lizzy: Thin Lizzy are a hard rock band formed in Dublin, Ireland in 1969. Two of the founding members, drummer Brian Downey and bass guitarist and lead vocalist Phil Lynott, met while still in school. Lynott led the group throughout their recording career of twelve studio albums, writing most of the material. Thin Lizzy's most successful songs, "Whiskey in the Jar" (a traditional Irish ballad), "Jailbreak" and "The Boys Are Back in Town", were all major international hits. After Lynott's death in 1986, various incarnations of the band emerged over the years based initially around guitarists Scott Gorham and John Sykes, though Sykes left the band in 2009. Gorham later continued with a new line-up including Downey.
Document 10: Vanlose Stairway: "Vanlose Stairway" is a song written by Northern Irish singer-songwriter Van Morrison and included on his 1982 album, "Beautiful Vision". It has remained a popular concert performance throughout Morrison's career and has become one of his most played songs.
Document 11: Blue Money: "Blue Money" is a song written by Northern Irish singer-songwriter Van Morrison. It was the second of two Top Forty hits from his 1970 album, "His Band and the Street Choir" (the other being "Domino"), reaching #23 on the US charts. The US single featured "Sweet Thing", from the album "Astral Weeks", as the B-side. It was released as a single in the UK in June 1971 with a different B-side, "Call Me Up in Dreamland". The song became Morrison's third best selling single of the 1970s, remaining on the charts for three months.
Document 12: The Power of Gloria Gaynor: The Power of Gloria Gaynor, also known as "The Power", or "The Power of Love", is the twelfth studio album by Gloria Gaynor, released in 1986, which is composed mostly of cover versions of other popular songs from the 1970s and 1980s, and is her only album to be released on Stylus Records. It was originally only released in the UK. The album was issued on record, compact disc and cassette, each containing bonus tracks of re-recorded versions of a few of Gaynor's biggest hits in a medley and a remixed version of "Don't You Dare Call It Love".
Document 13: Rock and Roll (Gary Glitter song): "Rock and Roll" (also known as "The Hey Song") is a song by English glam rock singer Gary Glitter that was released in 1972 as a single and on the album "Glitter". Co-written by Glitter and Mike Leander, the song is in two parts: Part 1 is a vocal track reflecting on the history of the genre, and Part 2 is a mostly instrumental piece. Both parts were popular in Britain, and the single went to No. 2 on the British charts. In concert, Glitter merged both into one performance.
Document 14: The Gloaming (group): The Gloaming is a contemporary Irish music supergroup formed in Ireland in 2011 consisting of musicians Martin Hayes, Iarla Ó Lionáird, Caoimhín Ó Raghallaigh, Dennis Cahill and New York pianist/producer Thomas Bartlett aka Doveman.
Document 15: Go Now: "Go Now" is a song composed by Larry Banks and Milton Bennett. It was first recorded in January 1964 by Bessie Banks, and later became associated with The Moody Blues.
ground_truth: 1964