Ten Years After was a British blues rock band formed in 1966, best known for their energetic live performances and the classic hit "I'd Love to Change the World." Led by guitarist Alvin Lee's distinctive fingerstyle playing, the group became legendary for their appearances at major festivals including Woodstock, where their performance became iconic. The band's raw blues-based rock sound and powerful stage presence made them one of the most influential rock acts of the late 1960s and 1970s.