In December 1967, the band completed their ''Hangman's Beautiful Daughter'' album at
Sound Techniques in
Chelsea, London. For the ISB's developments, they attempted to recreate as vividly as possible a live performance of their compositions. Lyrically, the compositions reflected upon past themes of life, mythology, and religious properties in a free musical structure,
esotericism becoming a consistent anchor in their recordings. The album features a series of vividly dreamlike
Robin Williamson songs, such as "The
Minotaur's Song", a surreal music-hall parody sung from the point of view of the mythical beast. Its centrepiece is
Mike Heron's "
A Very Cellular Song", a 13-minute reflection on life, love, and amoebas, whose complex structure incorporates a
Bahamian spiritual ("I Bid You Goodnight", originally recorded by the Pinder Family). The last part of "A Very Cellular Song", "May the Long Time Sun Shine", is sometimes wrongly referred to as a Sikh hymn or an Irish blessing, but is in fact an original song written by Mike Heron. The album's layered production style employs multitrack recording techniques and a wide array of instruments from across the world, including
sitar,
gimbri,
shenai,
oud,
harpsichord,
panpipes and
kazoo. ==Artwork and title==