The theme, "The X-Files", used more instrumental sections than most dramas. The theme song's famous whistle effect was inspired by the track "How Soon Is Now?" from the US edition of The Smiths' 1985 album "Meat Is Murder". After attempting to craft the theme with different sound effects, Snow used a Proteus 2 rackmount sound module with a preset sound called "Whistling Joe". After hearing this sound, Carter was "taken aback" and noted it was "going to be good". According to the "Behind the Truth" segment on the first season DVD, Snow created the echo effect on the track by accident. He felt that after several revisions, something still was not right. Carter walked out of the room and Snow put his hand and forearm on his keyboard in frustration. By doing so, he accidentally activated an echo effect setting. The resulting riff pleased Carter; Snow said, "this sound was in the keyboard. And that was it." The second episode, "Deep Throat", marked Snow's debut as solo composer for an entire episode. The production crew was determined to limit the music in the early episodes. Likewise, the theme song itself first appeared in "Deep Throat".