Question: Who was a lead vocalist of the rock band Boøwy from 1981 to 1988, Rico Blanco or Kyosuke Himuro ?

Context paragraphs:
Kyosuke Himuro: Kyosuke Himuro (氷室 京介 , Himuro Kyōsuke , born October 7, 1960 in Takasaki, Gunma, Japan) is a Japanese singer-songwriter and musician.  He was a lead vocalist of the rock band Boøwy from 1981 to 1988.  After the group disbanded he started a successful solo career, becoming one of Japan's best-selling artists.  In 2003, HMV Japan ranked Himuro at number 76 on their list of the 100 most important Japanese pop acts.  He currently lives in Los Angeles, California, where he purchased a palatial residence in Beverly Hills in 2004, which was previously owned by Shaquille O'Neal.

Buhay (album): Buhay (Filipino, "Life") is the ninth studio album of the Filipino rock band, Rivermaya.  It contains 16 tracks and was released under Warner Music Philippines in February 28, 2008.  This album is the first of Rivermaya without Rico Blanco as the band's vocalist.  He is replaced by then 18-year-old Jayson Fernandez, who won the search for a new vocalist in a series of reality TV auditions.  The band members took turns on vocals with the arrangement that whoever wrote the song, will be the one to sing it.  The band has released four singles from this album, ""Sugal ng Kapalaran"", ""Maskara"", ""Sleep"" and ""Ligawan Stage (Nerbyoso Part 2)"".

Trip (Rivermaya album): Trip is the second album from the Filipino rock band Rivermaya.  It has 13 tracks and released under BMG Records (Pilipinas) Inc. in 1996.  It is the first album that introduced Rico Blanco as the band's full-time guitarist after the departure of Perf de Castro a year earlier.

Yukinojo Mori: Masakazu Mori (Japanese: 森 正和 ) , better known by his stage name , is a Japanese lyricist, composer and poet.  He has written over 2,000 songs for numerous artists such as Kyosuke Himuro, Takuro Yoshida and Junichi Inagaki and theme songs for anime series including "Dragon Ball Z".  His younger brother is Hideharu Mori, keyboardist of the rock band Picasso.

Rivermaya: Rivermaya is a Filipino rock band.  Formed in 1994, it is one of several bands who spearheaded the 1990s Philippine alternative rock explosion.  Rivermaya is currently composed of original members Mark Escueta and Nathan Azarcon, together with Mike Elgar and Ryan Peralta.  Former original members include Rico Blanco, who had been the original songwriter of the band and vocalist Bamboo Mañalac, who later formed the band Bamboo and later went on his solo career.  Rivermaya is listed as the twentieth biggest-selling artists/act in the Philippines as of present.

Flowers for Algernon (album): Flowers for Algernon is the first solo album by Japanese singer Kyosuke Himuro.  Japanese rock group Boøwy, to which he once belonged, disbanded and this album was released as his solo debut five months later.

Boøwy: Boøwy (pronounced: bóui, stylized as BOØWY) was a Japanese rock band formed in Takasaki, Gunma in 1981.  The best-known lineup of Kyosuke Himuro (vocals), Tomoyasu Hotei (guitar), Tsunematsu Matsui (bass) and Makoto Takahashi (drums) reached legendary status in Japan during the 1980s.

Rico Blanco: Rico Rene Granados Blanco (born March 17, 1973) is a Filipino singer, songwriter, multi-instrumentalist, record producer, actor, endorser and entrepreneur.  He began his career as one of the founding members, and served as the chief songwriter, vocalist, guitarist, and keyboardist of the Filipino rock band Rivermaya from 1994 until 2007, and has been a solo artist since 2008.

Kanta Pilipinas: Kanta Pilipinas (English: "Sing Philippines") is a reality singing competition that airs on TV5.  It is hosted by Rico Blanco, Rivermaya's former lead vocalist.  With the tagline "Kanta Mo, Kwento Mo, Kapatid" (Your Song, Your Story, Sibling), the show premiered on February 9, 2013.  The show airs every Saturday at 9:00 PM (PST).

Isang Ugat, Isang Dugo: Isang Ugat, Isang Dugo (Filipino, "One Vein, One Blood") is the 8th studio album of the Filipino rock band, Rivermaya.  It contains 13 tracks and was released under Viva Records in 2006.  Except for "Isang Bandila", which is being used as the theme song of "Bandila", a news and current affairs program on ABS-CBN, the album contains covers of songs by some of the most influential Filipino alternative rock bands that commercially peaked in the 1980s.  This album is the last of Rivermaya with Rico Blanco as the vocalist.

Supporting paragraphs: Kyosuke Himuro Rico Blanco
Answer: Kyosuke Himuro