Question: Which singer is part of more bands, Josh Ramsay or Keisuke Kuwata?

Context paragraphs:
Sour Candy (Carly Rae Jepsen song): "Sour Candy" is a song by Canadian singer/songwriter Carly Rae Jepsen, released in October 2009 as the fourth and final single from her debut studio album, "Tug of War".  The song was written by Jepsen and Josh Ramsay, who also produced the song and is featured as a vocalist on the single version.  It failed to chart on the Canadian Hot 100, but did enter the Canada Hot AC airplay chart monitored by "Nielsen" BDS Radio.

Keisuke Kuwata (album): Keisuke Kuwata is the eponymous studio album recorded by Keisuke Kuwata, a frontman of the Japanese rock band Southern All Stars.  It was released by Taishita label under the Victor Entertainment in July 1988, shortly after the 10th anniversary of the band.  Aside from the 1982 live recording album "Kamon Yuzo and Victor Wheels Live" released under the pseudonym Yūzō Kamon, it was first Kuwata's solo effort.

Josh Ramsay: Joshua Keeler Ramsay is a Canadian singer, songwriter, producer, recording engineer, actor, and the lead vocalist of pop rock band Marianas Trench.

Hit Me Up (Danny Fernandes song): "Hit Me Up" is a song by Canadian singer Danny Fernandes.  The song features Josh Ramsay, lead vocalist for pop punk band Marianas Trench and rapper Belly.  It was the fourth single released from his second album "AutomaticLUV".  The song was released on October 2011 on radio and was later released on iTunes on December 13, 2011.

Who Do You Love (Marianas Trench song): "Who Do You Love" (stylized as "Who Do You Love?")  is a song recorded by Canadian pop rock group Marianas Trench for their fourth studio album, "Astoria" (2015).  The song was written and produced by lead singer Josh Ramsay.  "Who Do You Love" was released through 604 Records on September 8, 2016 as the record's third official single.

Pop 101: "Pop 101" (stylized as "POP 101") is a song recorded by Canadian pop rock band Marianas Trench, featuring hip hop artist Anami Vice.  Written and produced by lead singer Josh Ramsay, it was released July 29, 2014 through 604 Records, Cherrytree Records, and Interscope Records.  Originally announced as the lead single off the band's forthcoming fourth studio album, "Astoria" (2015), the song was later scrapped from the album and serves only as a buzz single; it is also included on their 2015 extended play, "Something Old / Something New".  "Pop 101" entered the Canadian Hot 100 at No. 27, and was certified Gold by Music Canada in November 2014.

One Love (Marianas Trench song): "One Love" is a song recorded by Canadian pop rock group Marianas Trench for their fourth studio album, "Astoria" (2015).  It was released to digital retailers through 604 Records, Cherrytree Records, and Interscope Records on September 14, 2015 as the album's lead single, and was later serviced to American hot adult contemporary radio on November 9, 2015 through 604 Records.  The song was written, composed, and produced by the band's lead singer, Josh Ramsay.

This Means War (Marianas Trench song): "This Means War" is a song recorded by Canadian pop rock group Marianas Trench for their fourth studio album, "Astoria" (2015).  It was serviced to Canadian radio on February 16, 2016 as the album's second official single.  The song was written and produced by the band's lead singer, Josh Ramsay.

Keisuke Kuwata: Keisuke Kuwata (桑田 佳祐 , Kuwata Keisuke , born February 26, 1956) is a Japanese multi-instrumentalist, singer-songwriter, and frontman for the Southern All Stars, as well of his own solo band, the Kuwata band.  He has also done significant amount of scoring music for films.  He went to Aoyama Gakuin University.

Hush (Emily Osment and Josh Ramsay song): "Hush" is a song written by American singer Emily Osment and Canadian singer Josh Ramsay.  They decided to collaborate when Osment went on a trip to Canada to film a movie, and met Ramsay.  They immediately hit it off, and decided to write a song together.  It officially premiered on Much Music on April 26, 2011.  The song was sent to Canadian radio on May 10, 2011, and released to Canada's iTunes Store on the same day.  Osment confirmed on her official Twitter that there will be a music video for the song to be released in September.  The music video never materialized and the song has only been released exclusively in Canada.

Supporting paragraphs: Josh Ramsay Keisuke Kuwata
Answer: Keisuke Kuwata