It's hard to believe Faithless' "Insomnia" came out way back in 1995 because it seemed to stay on endless rotation well into the 2000s. Blending dub, trance and spoken-word-style rap, it spoke to both rave culture and late-'90s restlessness.

A huge crossover hit, you couldn't go anywhere without hearing this track. It was a permanent fixture in cafes, radio playlists, and TV adverts as much as dancefloors, and wasn't just beloved by sleepless ravers in [redacted]-fuelled bouts of hedonism. Thanks to a bassline supposedly inspired by Justin Robertson's reggae-tinged "Lionrock" and the dubby leanings of Underworld, it found widespread appeal in the mainstream and even rock and metal crowds, too.

Despite being the band's biggest hit, the original went against every rule of pop. When they first turned the track in it was nine minutes long and opened with the line "I only smoke weed when I need to"—a big no-no for family-friendly MTV. Bill Padley (who also produced "The Tide Is High" and "Whole Again" for Atomic Kitten) pared the track down for a 7-inch edit, the first line was then switched to "Deep in the bosom of the gentle night", and a hit was born.