Were Kyosuke Himuro and Mike Score both in bands with names consisting of more than four letters?
yes
Mike Score
Michael Gordon "Mike" Score (born 5 November 1957) is an English musician.
 He is best known as the keyboardist, guitarist and lead singer of the new wave band, A Flock of Seagulls.
 He released a solo album on 1 March 2014 titled "Zeebratta".
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.
Tetragram
Tetragram means a group of four letters, such as a word that is exactly four letters long. 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. 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. History of a Six Weeks' Tour
History of a Six Weeks' Tour through a part of France, Switzerland, Germany, and Holland; with Letters Descriptive of a Sail Round the Lake of Geneva and of the Glaciers of Chamouni is a travel narrative by the English Romantic authors Mary Shelley and Percy Bysshe Shelley.
 Published in 1817, it describes two trips taken by Mary, Percy, and Mary's stepsister, Claire Clairmont: one across Europe in 1814, and one to Lake Geneva in 1816.
 Divided into three sections, the text consists of a journal, four letters, and Percy Shelley's poem "Mont Blanc".
 Apart from the poem, the text was primarily written and organised by Mary Shelley.
 In 1840 she revised the journal and the letters, republishing them in a collection of Percy Shelley's writings. Tutu (Egyptian official)
Tutu, the Egyptian official, was one of pharaoh's officials during the Amarna letters period: 1350-1335 BC.
 He is only found in the body of letters from Aziru, and his son, DU-Teššup.
 Four letters, EA 158, 164, 167, and 169, (EA for 'el Amarna') are addressed to the Pharaoh, by way of Tutu.
 DU-Teššup's single letter is written to pharaoh because his father Aziru is being detained in Egypt, and Aziru is needed to attend to affairs at home.
 Unless he were to remarry he may never return home again. Higher Self (album)
Higher Self is the third album by Japanese singer Kyosuke Himuro. Neo Fascio
Neo Fascio is the second album by Japanese singer Kyosuke Himuro. 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.