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Fireflies is een nummer van Owl City, het synthpop-project van Adam Young. Het nummer werd in juni 2009 uitgebracht als de eerste single van het album Ocean Eyes.

"Fireflies" is the debut single from American electronica project Owl City's album Ocean Eyes. Frontman Adam Young wrote the track about seeing fireflies in his hometown of Owatonna, Minnesota while he was awake with insomnia. Young produced the song alongside Matt Thiessen; the latter also provided guest vocals. The song is built around a "bleepy" synthline and includes lyrics about insomnia, fireflies and summer.

"Fireflies" topped the Billboard Hot 100 for two non-consecutive weeks. Outside of the United States, "Fireflies" also topped the charts in Australia, Denmark, Finland, Ireland, the Netherlands, Norway, Sweden, and the United Kingdom. "Fireflies" was Owl City's only top 10 hit on the Billboard Hot 100 until three years later when "Good Time", a duet with Canadian singer Carly Rae Jepsen, peaked at number eight on the chart. It has been covered by Christina Grimmie, Cheryl Cole and others.

"Fireflies" is featured in the video game Disney Sing It: Party Hits, and was used in the promotional video for EyePet. It is available as downloadable content for Guitar Hero 5, Guitar Hero: Warriors of Rock and Rock Band 3. The song was released as a free download on the game Tap Tap Revenge 3 by Tapulous.