Cult of Luna is a Swedish post-metal band from Umeå founded in 1998. Their style of music is similar to contemporary bands Neurosis and Isis. Cult of Luna was signed to Earache Records in the early 2000s and released five albums, including the commercially successful albums Salvation (2004) and Somewhere Along the Highway (2006). After an extended period of inactivity, Cult of Luna returned with its Indie Recordings debut Vertikal (2013) and companion EP Vertikal II (2013), both drawing inspiration from Fritz Lang's 1927 film, Metropolis. In 2016 the band released their space-themed collaborative album, Mariner, featuring American vocalist Julie Christmas.

Post-metal is a music genre rooted in heavy metal but exploring approaches beyond metal conventions while being related to and similar to post-rock. It emerged in the 1990s with bands such as Neurosis and Godflesh, who transformed metal texture through experimental composition. In a way similar to the predecessor genres post-rock and post-hardcore, post-metal offsets the darkness and intensity of extreme metal with an emphasis on atmosphere, emotion, and even "revelation", developing an expansive but introspective sound variously imbued with elements of ambient, noise, psychedelic, progressive, and classical music, and often shoegaze and art rock. Songs are typically long, with loose and layered structures that discard the verse–chorus form in favor of crescendos and repeating themes. The sound centres on guitars and drums, while any vocals are often but not always screamed or growled and resemble an additional instrument.