I enjoy some Tycho, Sigur Ros, Jam Bands, The Glitch Mob, and some Middle Eastern stuff (like Niyaz, Beats Antique) on my headphones while I medicate. Spotify is my lifeblood at home, travel and work.
I highly suggest some excellent headphones for your musical enjoyment for total music immersion. I currently use the V-Moda's Crossfade M100's (the bee's knees, excellent for some good bass) and Sennheiser's HD428's that I picked up super cheap. The crossfades are amplified well, but I use my Galaxy Nexus on the go for equally delicious tunes.