Fifth in a series of "Idiosyncratic Tone-Pieces" for concert organ (the instrument ideally of the "French Symphonic" variety). The darkly theatrical outer sections, characterized by a recitative-like melody supported by semi-contrapuntal subsidiary voices that coalesce into "triadicized" quartal harmonies within the web of a suspended but never quite absent tonality, encircle a slower and more restrained middle section (replete with canonic and non-canonic imitative counterpoint) that exploits the riches of the nonatonic "Houseini" scale (while also featuring "developmental reminiscences" of motivic material from the outer sections). The title derives from the obelisk-like qualities of the quartal harmonies, particularly in the introduction and coda. Note the final chord, a "tonicized" pentad deriving from the C Lydian Dominant scale, voiced with the fifth and root in the bass but including a destabilizing introgressive pitch (F) that's otherwise alien to the originating scale. The painting in the video is "Ruined Tower (Mediterranean Coast Scene with Tower)" by Thomas Cole.

Below you will find the full engraved score of this work:

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