Bad Here Day
From Halopedia, the Halo wiki
Bad Here Day is the second track in Halo Wars: Original Soundtrack.
The track opens with a piano and synth notes in a serene melody, accompanied with twinkling effects. Vocals join in as the main melody, which is echoed by synth notes. The melody is taken over by strings in a repeat of the melody before ending with synth notes.
The soundtrack's bonus DVD includes an alternate version, titled Bad Here Day (Shield Interior Intro Version), featuring piano and vocals on an upbeat variation of the melody, accompanied by heavy percussion.
Bad Here Day made its debut in the original Halo Wars demo, during Graeme Devine's introduction of the game.
The alternate version only plays in the beginning of the levels that place in the interior of Etran Harborage.