My obsession is obviously the Ramones - considering it's lasted since I bought the 45 of Blitzkrieg Bop in 1976, I'd say it's pretty entrenched by now. I do listen to other stuff, including the Black-Eyed Peas (great for working out), Chinn & Chapman (waits for Sid to read this! ), original punk bands like the Pistols, Clash, Stranglers, X-Ray Spex and so on, and since my father loved folk music of all kinds, Johnny Cash, the Eagles, and so on.
As well, my son is a musician, so I listen to his stuff. He does brilliant hardcore hip-hop, and is branching out into more punk/hardcore stuff as well.