Giacinto Scelsi: Quattro Pezzi per Orchestra (intégrale de l'oeuvre)

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This is Scelsi's most famous work, written in 1959, and arguably one of the most pioneering works of the 20th century. Each of the four movements sticks rigorously to a single note, the succession being in the keys of F, B, Ab, and A. As is normal in Scelsi's orchestral music, the instruments are concentrated in the low registers and include percussion. The brief 1st movement presents the melodic material - and it is indeed melodic, due to shading, rhythm and instrumental timbre. After the high drama of the second movement, the third (omitting percussion) has an ethereal quality about it which hangs beyond time in the slowly decaying sound of its final moments. The fourth movement has an extreme finality, with cadences punctuated by percussive outbursts, as if to say: I am sound.
http://en.wikipedia.org/wiki/Giacinto_Scelsi
http://www.classical.net/music/comp.lst/works/scelsi/4pezzi.php