Question: Who s the original and current lead singer of the Japanese heavy metal band, Loudness, Dave Matthews or Minoru Niihara?

Context paragraphs:
On the Prowl (album): On the Prowl is the ninth studio album released by the Japanese heavy metal band Loudness.  It is also their second and last album with American vocalist Mike Vescera, before his leaving to join Yngwie Malmsteen's band for the album "The Seventh Sign" (1994).  "On the Prowl" is mainly a compilation of self-covers of songs from early Loudness' albums, containing only three new songs written by the band (♠).  However, Mike Vescera translated and adapted the lyrics of the old songs written by former vocalist Minoru Niihara, to be sung in English.

Disillusion (album): Disillusion (撃剣霊化 , Gekken reika ) is the fourth studio album by Japanese heavy metal band Loudness.  It was recorded, mixed and mastered in London, England, in 1983 and released at the beginning of 1984.  The sound engineer chosen for the recording sessions was the expert Julian Mendelsohn, who had previously worked with acts like Yes, Elton John, Jimmy Page and Bob Marley.  The original Japanese version was licensed and released by Music for Nations in the UK and Roadrunner Records in Europe.  Attention by major US labels for the band and the need to make their work accessible to Western audiences, prompted a new release of the album with vocal tracks sung in English on July 1, 1984.  The English version opened the album with the instrumental "Anthem (Loudness Overture)" by Akira Takasaki, which was missing in the original Japanese release.

Dave Matthews: David John Matthews (born January 9, 1967) is a South African-born American singer-songwriter, musician and actor, best known as the lead vocalist, songwriter, and guitarist for the Dave Matthews Band.  Matthews was born in Johannesburg, and moved frequently between South Africa, the United Kingdom, and the United States while growing up.  Matthews mainly plays acoustic guitar, which he started playing at the age of nine.

Jealousy (Loudness EP): Jealousy is an EP by Japanese band Loudness.  It was released in May 1988 only in Japan, a market that the band felt to have neglected in favour of American audiences.  It would also mark the final recording with the classic line-up, until "Spiritual Canoe" in 2001.  Singer Minoru Niihara left the band after the end of the domestic tour promoting this release.  The song "Long Distance Love" would later be reworked for the "On the Prowl" album, with vocals by American singer Mike Vescera.

Minoru Niihara: Minoru Niihara (二井原 実 , Niihara Minoru ) (born March 12, 1960 in Osaka, Japan) is the original and current lead singer of the Japanese heavy metal band, Loudness.

Hurricane Eyes: Hurricane Eyes is the seventh studio album by Japanese heavy metal band Loudness.  It was released in 1987 worldwide with standard English lyrics.  A "Japanese Version" was subsequently released only in Japan later in the year with Niihara singing most of the lyrics in Japanese.

Pandemonium (Loudness album): Pandemonium (降臨幻術 , Kōrin genjutsu ) is the sixteenth studio album by Japanese heavy metal band Loudness.  It was released in 2001 only in Japan.  All music is credited to Loudness and all lyrics to Niihara.

The Birthday Eve: The Birthday Eve is the first studio album by Japanese heavy metal band Loudness.  It was released in 1981 only in Japan.  The 24bit digitally remastered Japanese limited edition CD includes two additional tracks not on the original release, coming from the first single of the band.  The success of the album was measured by Loudness' sold out debut concert at Asakusa International Theater, in front of an audience of 2.700.

Thunder in the East (album): Thunder in the East is the fifth studio album by Japanese heavy metal band Loudness, and the first released by a major American label after the contract signed with Atco Records, then a subsidiary of Atlantic Records.  Aside from being the band's first all-English release, it is the first Loudness album produced by Max Norman, who also produced "Lightning Strikes" in 1986 and "Soldier of Fortune" in 1989.  "Thunder in the East" features the single "Crazy Nights", the band's biggest hit in America, and the power ballad "Never Change Your Mind".  This album marked the first time a Japanese band entered the US Top 100 chart, where it remained for 23 weeks, peaking at No. 74.

Sly (band): Sly was a Japanese heavy metal band formed in 1994 by former members of popular groups of the Japanese metal scene.  The line-up included singer Minoru Niihara and drummer Munetaka Higuchi (Loudness), guitarist Shinichiro Ishihara (Earthshaker) and bassist Koichi Terasawa (Blizzard).  Sly disbanded in 1998, with Niihara and Higuchi re-joining Loudness in 2000 and Ishihara taking part in the reformation of his former group Earthshaker in 1999.

Supporting paragraphs: Minoru Niihara Dave Matthews
Answer: Minoru Niihara