Welsh progressive rock band formed in the late 1960s, known for blending elements of psychedelic rock, blues, and melodic progressive rock. Their sound is characterized by extended instrumental passages, intricate guitar work, and a fusion of improvisational and structured compositions. With a career spanning several decades, the band has undergone numerous lineup changes but remains a respected name in the progressive rock scene, celebrated for their live performances and their ability to evolve musically while maintaining a distinct identity.