This album established the aesthetic of twin lead guitars and is a masterpiece that combines the lyricism of folk with the power of hard rock.
This is their second album, which perfected the twin lead guitar harmony that has become synonymous with the British rock scene. The highlights are the melodic developments and lengthy improvisations.
The two guitarists' flowing twin lead harmonies, reminiscent of classical counterpoint, influenced many later rock bands. The album's dramatic structure, which shifts from the quiet melody of the acoustic guitar to the dynamic explosion of the band's sound, enhances its drama. The interwoven playing of the two guitarists pursues not only technique but also the beauty of melody. This album reached number 14 on the UK album chart, solidifying their commercial success. The album's structure, centered around long songs and featuring ample improvisation in the instrumental parts, also demonstrates their inclusion of elements of progressive rock.