The music of Cardiff has been dominated mainly by rock music since the early 1990s with later trends developing towards more extreme styles of the genre such as heavy metal and metalcore music. It, along with the nearby music scene in Newport, has brought a number of musicians to perform or begin their careers in South Wales.

The Newport music scene, in and around Wales' third city, has been well documented and acclaimed for cultivating bands, singers, and famous music venues. Newport has been traditionally a rock city since the 1970s, but it has evolved over the years to include forms of punk, 1990s alt-rock, and more recently metal and hip-hop.