Question: When did the explorer reach the city where the only group larger than the record label of The Lost Trident Sessions is headquartered?

Knowledge 1: The Lost Trident Sessions
The Lost Trident Sessions is a studio album by jazz fusion group the Mahavishnu Orchestra, released on 21 September 1999 through Sony Music Entertainment. It was originally recorded in June 1973 at Trident Studios but was not released until 26 years later. According to the album's detailed liner notes, in November 1998 Columbia Records producer Bob Belden stumbled upon two quarter-inch tapes in Columbia's Los Angeles vault whilst gathering material for a remastered reissue of the Mahavishnu Orchestra's 1973 album "Birds of Fire". The tapes were otherwise unlabelled besides the recording location, but upon further inspection, they were revealed to be the two-track mixes for what would have been the Mahavishnu Orchestra's third studio album at the time. [SEP] Knowledge 2: Sony Music
Doug Morris, who was head of Warner Music Group, then Universal Music, became chairman and CEO of the company on July 1, 2011. Sony Music underwent a restructuring after Morris' arrival. He was joined by L.A. Reid, who became the chairman and CEO of Epic Records. Under Reid, multiple artists from the Jive half of the former RCA/Jive Label Group moved to Epic. Peter Edge became the new CEO of the RCA Records unit. The RCA Music Group closed down Arista, J Records and Jive Records in October 2011, with the artists from those labels being moved to RCA Records. [SEP] Knowledge 3: Sony Music
RCA/Jive Label Group CEO Barry Weiss left the company in March 2011 to become the new CEO of Island Def Jam and Universal Republic, which were both part of Universal Music Group. Weiss had been the RCA/Jive Label Group CEO since 2008 and was head of Jive Records since 1991. [SEP] Knowledge 4: Sony Music
Sony Music Entertainment Inc. (sometimes known as Sony Music or by the initials, SME) is an American music corporation managed and operated by Sony Corporation of America (SCA), a subsidiary of Japanese conglomerate Sony Corporation. In 1929, the enterprise was first founded as American Record Corporation (ARC) and, in 1938, was renamed Columbia Recording Corporation, following ARC's acquisition by CBS. In 1966, the company was reorganized to become CBS Records. In 1987, Sony Corporation of Japan bought the company, and in 1991, renamed it SME. It is the world's second largest recorded music company, after Universal Music Group.
Knowledge 1: The Lost Trident Sessions
The Lost Trident Sessions is a studio album by jazz fusion group the Mahavishnu Orchestra, released on 21 September 1999 through Sony Music Entertainment. It was originally recorded in June 1973 at Trident Studios but was not released until 26 years later. According to the album's detailed liner notes, in November 1998 Columbia Records producer Bob Belden stumbled upon two quarter-inch tapes in Columbia's Los Angeles vault whilst gathering material for a remastered reissue of the Mahavishnu Orchestra's 1973 album "Birds of Fire". The tapes were otherwise unlabelled besides the recording location, but upon further inspection, they were revealed to be the two-track mixes for what would have been the Mahavishnu Orchestra's third studio album at the time. [SEP] Knowledge 2: Sony Music
Doug Morris, who was head of Warner Music Group, then Universal Music, became chairman and CEO of the company on July 1, 2011. Sony Music underwent a restructuring after Morris' arrival. He was joined by L.A. Reid, who became the chairman and CEO of Epic Records. Under Reid, multiple artists from the Jive half of the former RCA/Jive Label Group moved to Epic. Peter Edge became the new CEO of the RCA Records unit. The RCA Music Group closed down Arista, J Records and Jive Records in October 2011, with the artists from those labels being moved to RCA Records. [SEP] Knowledge 3: Jive Records
Jive Records was an American record label under the RCA Music Group formed in 1981 by Zomba Records. Formerly headquartered in New York City, the label was best known for a string of successes with hip hop artists in the 1980s, and also in teen pop and boy bands during the 1990s and early 2000s. [SEP] Knowledge 4: Sony Music
Sony Music Entertainment Inc. (sometimes known as Sony Music or by the initials, SME) is an American music corporation managed and operated by Sony Corporation of America (SCA), a subsidiary of Japanese conglomerate Sony Corporation. In 1929, the enterprise was first founded as American Record Corporation (ARC) and, in 1938, was renamed Columbia Recording Corporation, following ARC's acquisition by CBS. In 1966, the company was reorganized to become CBS Records. In 1987, Sony Corporation of Japan bought the company, and in 1991, renamed it SME. It is the world's second largest recorded music company, after Universal Music Group.
Knowledge 1: The Lost Trident Sessions
The Lost Trident Sessions is a studio album by jazz fusion group the Mahavishnu Orchestra, released on 21 September 1999 through Sony Music Entertainment. It was originally recorded in June 1973 at Trident Studios but was not released until 26 years later. According to the album's detailed liner notes, in November 1998 Columbia Records producer Bob Belden stumbled upon two quarter-inch tapes in Columbia's Los Angeles vault whilst gathering material for a remastered reissue of the Mahavishnu Orchestra's 1973 album "Birds of Fire". The tapes were otherwise unlabelled besides the recording location, but upon further inspection, they were revealed to be the two-track mixes for what would have been the Mahavishnu Orchestra's third studio album at the time. [SEP] Knowledge 2: Sony Music
RCA/Jive Label Group CEO Barry Weiss left the company in March 2011 to become the new CEO of Island Def Jam and Universal Republic, which were both part of Universal Music Group. Weiss had been the RCA/Jive Label Group CEO since 2008 and was head of Jive Records since 1991. [SEP] Knowledge 3: Jive Records
Jive Records was an American record label under the RCA Music Group formed in 1981 by Zomba Records. Formerly headquartered in New York City, the label was best known for a string of successes with hip hop artists in the 1980s, and also in teen pop and boy bands during the 1990s and early 2000s. [SEP] Knowledge 4: Sony Music
Sony Music Entertainment Inc. (sometimes known as Sony Music or by the initials, SME) is an American music corporation managed and operated by Sony Corporation of America (SCA), a subsidiary of Japanese conglomerate Sony Corporation. In 1929, the enterprise was first founded as American Record Corporation (ARC) and, in 1938, was renamed Columbia Recording Corporation, following ARC's acquisition by CBS. In 1966, the company was reorganized to become CBS Records. In 1987, Sony Corporation of Japan bought the company, and in 1991, renamed it SME. It is the world's second largest recorded music company, after Universal Music Group.

Answer: August 3, 1769