Paul D. Hudson, known professionally as H.R., is an American musician who leads the hardcore punk band Bad Brains, and is an instrumental figure in the development of the genre. His vocal delivery has been described as diverse, ranging from a rapid-fire nasal whine, to feral growling and screeches, to smooth near-crooning or staccato reggae rhymes. He has departed the band periodically to pursue solo efforts that are more reggae than Bad Brains' punk sound. He is the older brother of Earl Hudson, Bad Brains' drummer.

Minor Threat was an American hardcore punk band, formed in 1980 in Washington, D.C., by vocalist Ian MacKaye and drummer Jeff Nelson. MacKaye and Nelson had played in several other bands together, and recruited bassist Brian Baker and guitarist Lyle Preslar to form Minor Threat. They added a fifth member, Steve Hansgen, in 1982, playing bass, while Baker switched to second guitar.