"Fireflies" is a popular song by Owl City, released in 2009. It is written and composed by Adam Young, the sole member and creator of Owl City. The song is in the original key of Eb major. "Fireflies" achieved commercial success, primarily in the United States, reaching the top of the charts in several countries. It was praised for its whimsical and dreamy lyrics, which depict a fantasy world illuminated by fireflies. The melody is characterized by its catchy electronic sounds and synth-pop elements, creating a nostalgic and uplifting atmosphere. Notable trivia around the song includes the fact that it was inspired by Young's experiences growing up in the small town of Owatonna, Minnesota. Overall, "Fireflies" remains one of Owl City's most recognizable and beloved songs.