If you want to own the lossless file permanently for your local media library, several reputable audiophile platforms offer Ocean Eyes (the album featuring "Fireflies") in legal FLAC format:
: Offers "Fireflies" in various formats, including uncompressed lossless WAV and compressed lossless FLAC .
"Fireflies" is a wall of sound. It features heavy layering of synthesizers, vocal chops, and ambient textures. In low-quality MP3s, the "sparkle" of the synths can sound metallic or blurry. In FLAC, the separation between the bass throbs and the twinkling high-end arpeggios is distinct and clear.
Spectral Architecture and Production Analysis of Owl City’s "Fireflies" (2009): A High-Fidelity Perspective
To get the best audio quality, you can purchase and download the track from these platforms:
Let’s be realistic. If you listen to music on a Bluetooth speaker in the shower, or through your car’s stock radio on a highway, is overkill. The ambient noise floor masks the subtle differences.