Question: Are both John Tardy and Jun. K vocalists ?

Context articles: 2PM
Jun Fukuyama
J. J. Sakurai
Give Me Love (2PM song)
Jun. K
Obituary (band)
It's My Party!
John Tardy
Donald Tardy
Jacque Alexander Tardy

2PM (Hangul: 투피엠 ) is a South Korean boy band formed by JYP Entertainment.
 The current members are Jun.
 K (formerly known as Junsu), Nichkhun, Taecyeon, Wooyoung, Junho and Chansung.
 Former leader Jay Park officially left the group in early 2010.
Jun Fukuyama (福山 潤 , Fukuyama Jun , born November 26, 1978) is a Japanese voice actor and singer.
 His popular roles include Roy in "Super Smash Bros.", Lelouch in "Code Geass", Koro-sensei in "Assassination Classroom", Ichimatsu in "Osomatsu-san", Kimihiro Watanuki" in "xxxHOLiC", Yata Misaki in "K", and the protagonist in "Persona 5".
Jun John Sakurai (桜井 純 , Sakurai Jun , January 31, 1933 – November 1, 1982) was a Japanese-American particle physicist and theorist.
"Give Me Love" is the seventh Japanese single (counted as sixth) by the South Korean boy band 2PM.
 It was released on May 29, 2013 in three different editions.
 The single also includes "Falling in Love (composed by Jun K.) as B-side track, which was supposed to be included in "Masquerade".
Kim Min-jun (; born January 15, 1988), better known by his stage name Jun.
 K, is a South Korean singer, songwriter, record producer, rapper, dancer and actor.
 He is the main vocalist of 2PM.
Obituary is an American death metal band formed in October 1984 in Tampa, Florida.
 Initially called Executioner, the band changed their name to Xecutioner in 1986 to avoid confusion with the thrash metal band Executioner from Boston, and then changed their name once again to Obituary in 1988.
 The band's current lineup consists of vocalist John Tardy, lead guitarist Kenny Andrews, rhythm guitarist Trevor Peres, bassist Terry Butler, and drummer Donald Tardy.
 Obituary has gone through several lineup changes, with Peres and the Tardy brothers being the only constant members.
 The band was a fundamental act in the development of death metal music, and is one of the most successful death metal bands of all time.
 To date, Obituary has released ten studio albums, and with the exception of their 1997–2003 split, they continue to perform live around the world.
It's My Party!
 (stylized as IT'S MY PARTY!)
 is a 1960s-inspired teen girl group from Rochester, New York.
 Founded in 1985, the band consists of three vocalists who are regularly renewed.
 There have been over 32 vocalists since the group was founded.
 It's My Party!
 performs covers of 1960s hit songs and original material written by John Giotto, Paul Kanack, and Syeed Abdulal-Haqq with the help of Ron Stein.
 It's My Party!
 was included in John Clemente's book "Fabulous Females Who Rocked the World" in 2013.
John Tardy (born March 15, 1968) is an American vocalist best known for his work with the death metal band Obituary and Tardy Brothers.
 He is the brother of Donald Tardy who is the drummer of Obituary.
Donald 'DT' Tardy (born January 28, 1970) is the drummer of death metal band Obituary and the brother of John Tardy, who is the lead singer of the band.
 Besides Obituary, they have a band called Tardy Brothers, where, as primary songwriter and engineer, Donald also plays guitar and bass, as well as drums.
 Donald also played drums for Andrew W.K on the album I Get Wet and was Andrew W.K.'s first touring drummer who also assisted with assembling the original Andrew W.K. lineup.
Jacque Alexander Tardy (1767 – June 15, 1827) better known as "Tardy the Pirate", (a.k.a. John Tardy or John Late) was an unsuccessful and atypical pirate who usually poisoned his victims.