Here are some of the most iconic and "badass" classical music composition:

Wagner's "Ride of the Valkyries" - This bombastic, heavily orchestrated excerpt from the opera Die Walküre has become one of the most recognizable and thrilling pieces of classical music.

Beethoven's Symphony No. 5 - This powerful, dramatic symphony opens with one of the most recognizable musical motifs of all time. The driving, forceful energy throughout the piece is considered one of Beethoven's most bold and triumphant works.

Stravinsky's The Rite of Spring - This innovative, avant-garde ballet score features dissonant, primal rhythms and harmonies that were considered extremely shocking and provocative when it premiered in 1913.

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The opulent and ornate nature of Baroque music gradually gave way to the more balanced, clear-cut forms of the Classical era.

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Some of the greatest dark classical music works include:

Beethoven's Symphony No. 9 ("Choral") - The famous finale of this symphony, with its dark and ominous minor key passages, is considered one of the most powerful and emotionally intense works in the classical repertoire.

Verdi's Requiem - This large-scale choral work is infused with a deeply solemn and foreboding atmosphere, evoking themes of mortality and the afterlife.

Shostakovich's Symphony No. 5 and No. 8 - These symphonies by the Russian composer feature brooding, unsettling tonalities that capture the oppression and turmoil of the Soviet era.

Ligeti's Requiem and Lux Aeterna - These 20th century avant-garde works utilize dissonant harmonies and eerie, atmospheric textures to create a profound sense of darkness and unease.

Gorecki's Symphony No. 3 ("Symphony of Sorrowful Songs") - This powerful work draws on Polish folk melodies and religious themes to express deep grief and mourning.

Mahler's Symphony No. 6 ("Tragic") - The ominous hammer blows in the finale of this symphony are considered one of the most haunting moments in the classical canon.