Leitmotif/Web Original


 * In Echo Chamber, Shannon's entrances are marked by Psycho Strings.
 * It's Gendo!
 * Whenever Sting showed up in Dune wearing a speedo, The Nostalgia Chick would play "Don't Stand So Close To Me".
 * Any appearance by Tex in Red vs. Blue is usually accompanied by the opening bars of her theme.
 * With the exception of Season 8, though her new theme, Agent Tex contains a nod to her original leitmotif.
 * The Meta has one in the Recollections seasons: "(When) Your Middle Name Is Danger".
 * In YuGiOh Abridged, the opening for Sexy Back loops whenever Duke Devlin speaks. Also, the "Double Fine" riff of Judas Priest's Hellion plays at the beginning of any of Dartz's scenes.
 * The Yogscast has "I'm a dwarf and I'm digging a hole! DIGGY DIGGY HOLE!" and variations of such. It comes from Shadow of Israphel, when Simon is digging for.
 * In Dr. Horrible's Sing-Along Blog, the eponymous character has his own theme which plays during the act openings and as part of two songs. In one song, when he switches from philosophizing to Evil Gloating halfway through, the background music also changes to his theme repeating until the song's end. In another song, a slowed-down version with heavy downbeats plays during a Suit-Up of Destiny sequence.
 * In Everyman HYBRID, HABIT has "Who Could Win a Rabbit" by Animal Collective. And it's just as scary as he is.
 * The Hitchhiker/ from Suburban Knights has a menacing, drum-based one that plays whenever he appears.
 * In early episodes of Atop the Fourth Wall, the arrival of '90s Kid would be marked with "Smells Like Nirvana" and it would often keep playing until he was cut away from. Later, it was swapped out for the genuine article and is usually not used at all if he's appearing in a dramatic scene.
 * The entity  has "evil" or alternatively "satanic" from the Ren and Stimpy soundtrack (though that bit was unintentional.)
 * Kung-Tai Ted and The Ninja-Style Dancer (From Atop the Fourth Wall, above) seem to share "Jet-Set" by Alphaville.
 * The utterly deranged version of Fluttershy depicted in Friendship Is Witchcraft seems to be associated with "Hellfire".
 * Frequent True Capitalist Radio caller 213 (the Ghetto Capitalist) is often accompanied by the sound of a crying baby as he trolls the the host Ghost. This often leads to Ghost telling him to "stop choking that damn kid".
 * The title character of 80's Dan has "Take on Me".
 * When Nash of What The Fuck Is Wrong With You? encounters rampant douchebaggery on a massive scale (summarily titled 'Douchequakes') he plays Gunther's Ding-Dong Song over clips of stuff collapsing, falling over, et cetera.
 * One episode of WTFIWWY Live! was so bad, he played the song over the live feed of the webcast.
 * The tune that plays most over The Nostalgia Critic's depressed moments is this crushing piece of Lonely Violin Music.