Abaddon's Bolero Originally On "Trilogy" Album - 1972 "Abaddon's Bolero" Sounds Like A Martialized Bolero In 4/4 Rhythm Rather Than The Usual 3/4 . A Single Melody Containing Multiple Modulations Within Itself Is Repeated Over And Over In Ever More Thickly Layered Arrangements Starting From A Quiet Hammond Organ Making A Flute-Like Sound Over A Snare Drum And Building Up To An Ear-Shattering Wall Of Sound. This Aspect May Well Be A Nod To The Similar Effect In Maurice Ravel's Famous Bolero. Abaddon's Bolero Is Very Replete With Overdubs. Almost Every Time Another Instrument Comes In It's Another Overdub. Genre Progressive Rock Bolero