Danielle "Danz" Johnson (born February 20, 1989), known professionally as Danz CM and formerly Computer Magic, is an American musician and producer based in New York City. She is a singer, songwriter, composer, music producer, DJ, and the founder of the music project Synth History and the indie record label Channel 9 Records. She also composes music for commercials, especially for Japanese brands.
From 2010 until mid 2020, Johnson used the moniker Computer Magic, a name derived from a quote by Viv Savage in This Is Spinal Tap: "quite exciting this computer magic!". In August 2020, she announced that she changed her moniker to Danz CM.
According to Allmusic, her music is "spacy, sci-fi-influenced synth pop". Johnson released 3 studio albums (Davos in 2015, Danz in 2018 and The Absurdity of Human Existence in 2021), 2 compilations (Super Rare in 2017, COVERS 2010–20 in 2020), a string of EPs and singles, plus Japan edition albums.