Unlike the other Horslips albums I have reviewed on Amazon, this album gains force from its accrued impact, rather than its individual tracks. Like "Táin," "Book" is meant to work as a unified single piece of music, as the subtitle defines it. Songs are chapters in a book, verses of a poem.
Instrumental and sung passages alternate in the three movements of the album from Geantrai--cheerier songs-- to Goltrai-- laments--to Suantrai-- songs of sleep or dreams. These unify as in storytelling various "branches" of the tale and classify them in ancient Irish categories of narrative craft and intent. It's a "Celtic symphony," therefore, in the ebbs and crests of the musical representation and the lyrical explanation of the energetic clashes and couplings the Book of Invasions (Leabhar Gabhala) relates-- the tribes who landed in pre-Christian Ireland successively to fight over its land and its wealth.
More at the link.

