Roky Erikson of 13th Floor Elevators

Roky Erickson (born Roger Kynard Erickson on July 15, 1947) is an American singer, songwriter, harmonica player and guitarist from Texas. He was a founding member of the 13th Floor Elevators and pioneer of the psychedelic rock genre.
Erickson is one of rock and roll's most famous cult figures, perhaps as well-known for his mental illness — caused in no small part by ill-advised shock therapy and incarceration in a Texas mental hospital — as for his musical talents. source: Wikipedia

Keith West of Tomorrow

Keith West (born 6 December 1943 in Dagenham, Essex, England as Keith Alan Hopkins) was the lead singer of Tomorrow, a 1960s psychedelic rock band. West composed most of the band's songs (duly credited to Keith Hopkins). Despite critical acclaim and support from DJ John Peel, who featured them on his "Perfumed Garden" BBC Radio 1 show, the band was not a great financial success.
In 1964 West became lead singer of "In Crowd" a rock band from London, which renamed in "Tomorrow" later. Member of the Band was the guitarist Steve Howe (later "Yes"). 1967 he became acquainted with Mark Wirtz, a producer who already created the instrumental title "A Touch of Velvet, a Sting of Brass" (1965). Later on the melody became theme song for the German music TV show "Beat-Club" and "Musikladen".
West himself is perhaps better known as a participant of Mark Wirtz's A Teenage Opera, completed in 2002. He was the singer of "Excerpt from "A Teenage Opera"," also known as "Grocer Jack," which reached No. 2 on the UK Singles Chart in 1967. He also performed "Sam," which reached the bottom end of the Top 40 the same year.
In 1968 he released the single "On A Saturday" on Parlophone. Other musicians who appeared on the single were guitarist Steve Howe, bassist Ron Wood, and drummer Aynsley Dunbar. An excellent piece of pop-psychedelia, the record was a modest UK hit. It has since been re-issued on the 1999 remastered CD of the self titled debut by Tomorrow.
In 1971 he released a solo L.P. "Wherever My Love Goes" on the German progressive rock-label Kuckuck. It features his songwriting-partner Ken Burgess and steel guitarist Glenn Campbell (ex-The Misunderstood). Two tracks of it were produced by Andrew Loog Oldham.
In the mid-1970s he was singer for Moonrider.
West continues to produce and record music, which is used primarily within the advertising industry. Source: Wikipedia

Phil Lynott of Thin Lizzy

Philip Parris Lynott (August 20, 1949 – January 4, 1986) was an Irish singer, instrumentalist and songwriter, who first came to prominence as the frontman of Thin Lizzy. more here

Freddie Mercury of Queen

Freddie Mercury (born Farrokh Bulsara; 5 September 1946 – 24 November 1991) was a British musician, best known as the lead singer of the rock band Queen (inducted into the Rock and Roll Hall of Fame in 2001). He is noted for his vocal abilities and for his live performances. As a songwriter, he composed many international hits, including "Bohemian Rhapsody", "Killer Queen", "Somebody to Love", "We Are the Champions" and "Crazy Little Thing Called Love". In addition to his work with Queen, he also produced several hits as a solo artist. Mercury, who was of Indian Parsi descent and who grew up in India, has been referred to as "Britain's first Asian pop star." He died of complications from AIDS in 1991. More

Ronnie Van Zant of Lynyrd Skynyrd

Ronald Wayne "Ronnie" Van Zant (January 15, 1948 – October 20, 1977) was the lead vocalist, primary lyricist, and a founding member of the Southern Rock band Lynyrd Skynyrd. He was the older brother of .38 Special founder and vocalist Donnie Van Zant and current Lynyrd Skynyrd lead vocalist Johnny Van Zant.

Born and raised in Jacksonville, Florida Van Zant aspired to be many things before finding his love for music. Notably, Ronnie was interested in becoming a boxer (as Muhammad Ali was one of his idols); this profession seemed fit, as Ronnie had the reputation for being a "tough" person. Ronnie also tossed around the idea of becoming a stock-car racer. In fact, Ronnie used to say that he was going to be the most famous person to come out of Jacksonville since Lee Roy Yarbrough. However, after seeing The Rolling Stones with his future bandmates, Ronnie knew what he wanted to do. More Reading.

Keith Moon of The Who

Keith John Moon (August 23, 1946 – September 7, 1978) was the drummer of the rock group The Who. As a drummer, Moon became known for an innovative style of drumming. Moon was one of the first players to play the drums as a lead instrument in an era when drums were supposed to only keep the backbeat. Moon also gained notoriety for his destructive lifestyle. He is widely regarded as one of the greatest and most unique of all rock and roll drummers. Link

John Bonham of Led Zeppelin

John Henry "Bonzo" Bonham (May 31, 1948 – September 25, 1980) was a British drummer and member of the English rock band Led Zeppelin. He was renowned for his power, speed and "feel" for the groove. Bonham is considered one of the most influential and respected drummers of the modern rock era and continues to be cited as an influence on drummers of varying styles to this day. Read more here