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Horrible Heartbeat (戦慄の鼓動 Senritsu no Kodō?), also known as Shivery Beat or Pulse of the Terror, is a music theme originally composed for Contra. It is the background theme for the last stage of the game, Alien's Lair. Since then it has become a widely popular theme and diverse arrangements have appeared throughout the series, as well as in promotional media.

Audio[]

Title Game Stage Audio Usage
Horrible Heartbeat Contra (arcade) Alien's Lair BGM
Shivery Beat Contra (NES) Alien's Lair BGM
Contra: Operation Galuga (Retro Mix) Alien Hive
Shivery Beat Contra (MSX2) Alien's Zone
Vicious Space
BGM
Fighting Jungle 2 Wai Wai World 2: SOS!! Parsley Castle World 4 Alien King boss fight
Alien Lair Operation C Area 5 Hayanos 614 and Black Viper boss fights
Heart Battle Contra 4 Alien Hive Gomeramos King boss fight
Contra: Operation Galuga (WayForward Mix) Ruins Beowulf miniboss fight
Horrible Heartbeat Contra ReBirth Red Falcon Megalith BGM
Shivery Beat Contra: Evolution Alien's Lair BGM
Contra Returns Stages 2-6, 5-3, 5-4, 12-5, 13-1, 13-4, 13-6, 15-3, 15-4 BGM
What they were Growing in the Lab Contra: Operation Galuga Escape Ship (inside Java section) BGM
Alien Slayer Contra: Operation Galuga (Retro Remix) Alien Hive BGM
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