Pentad may refer to:
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A pentachord in music theory may be either of two things. In pitch-class set theory, a pentachord is defined as any five pitch classes, regarded as an unordered collection (Roeder 2001). In other contexts, a pentachord may be any consecutive five-note section of a diatonic scale (Latham 2002). A pentad is a five-note chord (Bailey 1991, 450).
Under the latter definition, a diatonic scale comprises five non-transpositionally equivalent pentachords rather than seven because the Ionian and Mixolydian pentachords and the Dorian and Aeolian pentachords are intervallically identical (CDEFG=GABCD; DEFGA=ABCDE).
The name "pentachord" was also given to a musical instrument, now in disuse, built to the specifications of Sir Edward Walpole. It was demonstrated by Karl Friedrich Abel at his first public concert in London, on 5 April 1759, when it was described as "newly invented" (Knape, Charters, and McVeigh 2001). In the dedication to Walpole of his cello sonatas op. 3, the cellist/composer James Cervetto praised the pentachord, declaring: "I know not a more fit Instrument to Accompany the Voice" (Charters 1973, 1224). Performances on the instrument are documented as late as 1783, after which it seems to have fallen out of use. It appears to have been similar to a five-string violoncello (McLamore 2004, 84).
Let the blood spill, between my broken teeth
The desert landscapes stretch on the infinite horizon
Monotonous and wild
Unchain the wrath, naked skin tries to stay closed
Under the atrocious lashing sounds
Step by step appear the lugubrious furrows
Drawn by the born rivers
Their streams dig again and again, corrode the ground
Torturing the wide expanses
The sky turns black, the surfaces become quivering
The fleshy mountains like alive proudly rise
Cut in their middle, pierced under the rock
Opening the labyrinths of human thoughts
Lacerated plains by barbaric passages
Underground flows and plaintive whispers
Floods and earthquakes
Lightning strikes, traumatizes and signs the eternity with a forgotten name
Beneath a blinding light
A blinding light
The ground separates, cut in several places
The imprint of hostile elements is close to be made
Break
I clench my jaws and I bite as strong as I can
I let the blood spill between my broken teeth
Lava currents drown
The fissures
And spread the running disease
Hidden under indelible scars
Damages are made of a delicious disharmony
Like a bow sliding at random on a out of tune violin
Shapeless and devastating magmas search for the path of the surface
Fighting hopeless not to be broken
The desert landscapes stretch on the infinite horizon
Monotonous and wild
Unchain the wrath, naked skin tries to stay closed
Under the atrocious lashes
Lava currents drown
The fissures
And spread the running disease