: An 80s-inspired synth-pop track that highlights the group's vocal range.

Take the bonus track In MP3, it feels like a generic album filler. In FLAC , the acoustic guitar plucks have decay; the backing vocals are layered in a call-and-response across the stereo field. It transforms a B-side into a vocal showcase.

Perhaps the most synth-heavy pop track on the record, "Sledgehammer" utilizes a pulsing beat that mimics a heartbeat. The bridge features some of the group's best harmonies. In a lossless format, the reverb tails on the vocals fade naturally into the mix, creating a spacious, atmospheric sound that standard compression often cuts short.

The album is a masterclass in mid-2010s pop production, featuring contributions from hitmakers like Stargate, Dr. Luke, and Ammo. : An up-tempo opener that sets the rhythmic tone.

Released on January 30, 2015 Reflection is the debut studio album by American girl group Fifth Harmony , following their success on The X Factor US Deluxe Edition