Megalovania was composed by Toby Fox and became iconic as Sans's boss battle theme in the 2015 RPG Undertale, where its relentless bassline turns the game's final fight into a pressure cooker. The melody had already appeared in Fox's earlier Homestuck work, which helped it travel fast once players started sharing the track. Years later it remains one of the most remixed pieces of game music on the internet, appearing in bass-boosted gaming remixes, boss fight montages and countless memes because that opening riff is instantly recognisable.