At the moment nothing, I'm skipping between artists, songs and genres on an hourly basis. Today I listened to a lot of Bowling For Soup, but a lot is just relative the inconsistancy of my choice of music. Frank Sinatra has made an appearance.
The longest running "music obsession" was with Fall Out Boy, I spent months listening to almost nothing but Folie A Deux and Infinity on High, and From Under The Corktree defined my high school career. Other artists that have seen high frequency of play in the past range from Eminem (a solid couple of months), Michael Jackson, The Beatles (arguably my favourite band of all time, but even they didn't enjoy such a concentrated play extravaganza as FOB did), The Used, Silversun Pickups, The Hush Sound, Frank Sinatra, Lamb of God, System of a Down, We Butter The Bread With Butter, Marilyn Manson, Rammstein, and that's all I can think of right now. They all enjoyed LONG periods of repeated consistant play without variation.
Now though, nothing.