William Rory Gallagher was an Irish musician and songwriter. He is known for his virtuosic style of guitar playing, and is often referred to as "the greatest guitarist you've never heard of". A number of guitarists, including Alex Lifeson of Rush, Brian May of Queen, and Eric Clapton, have cited Gallagher as an influence. He was voted as guitarist of the year by Melody Maker magazine in 1972, and listed as the 57th greatest guitarist of all time by Rolling Stone magazine in 2015.

Blues rock is a fusion genre and form of rock music that relies on the chords/scales and instrumental improvisation of blues. It is mostly an electric ensemble-style music with instrumentation similar to electric blues and rock. From its beginnings in the early to mid-1960s, blues rock has gone through several stylistic shifts and along the way it inspired and influenced hard rock, Southern rock, and early heavy metal.