Decyfer Down is an American Christian rock band formed in 1999 and based in Morehead City, North Carolina, United States. Until 2002 – the year that Christopher Clonts joined the band – they went by the moniker Allysonhymn. Decyfer Down is well known in Christian music, but the band is also known for their mainstream success, having toured with bands like Puddle of Mudd and Breaking Benjamin.

Christian rock is a form of rock music that features lyrics focusing on matters of Christian faith, often with an emphasis on Jesus, typically performed by Christian individuals. The extent to which their lyrics are explicitly Christian varies between bands. Many bands who perform Christian rock have ties to the contemporary Christian music labels, media outlets, and festivals, while other bands are independent.