Roots of Jethro Tull

Roy Harper is an English folk rock singer, songwriter, poet and guitarist. He has released 22 studio albums across a career that stretches back to 1966. As a musician, Harper is known for his distinctive fingerstyle playing and lengthy, lyrical, complex compositions, reflecting his love of jazz and the poet John Keats.

Whitesnake were an English rock band formed in London in 1978. The group originated as the backing band for singer David Coverdale, who had recently left Deep Purple. Though the band quickly developed their own entity, Coverdale was the only constant member throughout their history.

Louis Andrew Grammatico, known professionally as Lou Gramm, is an American singer and songwriter. He is best known as co-founder and original frontman of the rock band Foreigner from 1976 to 1990 and again from 1992 to 2003, during which time the band had numerous successful albums and singles.

The Four Seasons were an American rock band formed in 1960 in Newark, New Jersey. Since 1970, they have also been known at times as Frankie Valli and the Four Seasons. They are one of the best-selling musical groups of all time, having sold an estimated 100 million records worldwide.

Isaiah Ross, known as Doctor Ross, was an American blues musician who usually performed as a one-man band, simultaneously singing and playing guitar, harmonica, and drums. Ross's primal style has been compared to John Lee Hooker, Blind Boy Fuller and Sonny Boy Williamson I.

U.K. were a British progressive rock supergroup originally active from 1977 to 1980. The band was founded by bass guitarist John Wetton and drummer Bill Bruford, formerly the rhythm section of King Crimson. The band was rounded out by violinist/keyboardist Eddie Jobson, and guitarist Allan Holdsworth. Bruford and Holdsworth left in 1978, and Bruford was replaced by drummer Terry Bozzio. Jobson, Wetton and Bozzio reformed U.K. for a world tour in 2012.

Family were an English rock band, active from late 1966 to October 1973, and again since 2013 for a series of live shows. Their style has been characterised as progressive rock, as their sound often explored other genres, incorporating elements of styles such as folk, psychedelia, acid rock, jazz fusion, and rock and roll. The band achieved recognition in the United Kingdom through their albums, club and concert tours, and appearances at festivals.

Freedom was an English psychedelic rock band, active in the late 1960s and early 1970s, formed initially by ex-members of Procol Harum.