I've been listening to a lot of classical music lately. Especially at work while dispatching buses. Pop music and the like (usually 89.3 the Current) is intolerable for some reason while working. More epic classical seems to work well. Lately, in particular I've been fond of Maurice Ravel's Bolero.
An interesting note about Bolero, elements of this piece were used in the music for the famous fight scene in the original Star Trek episode Amok Time, where Kirk and Spock fight each other because Spock's betrothed wife picked Kirk as her champion.