While listening to any music can be beneficial, I find that music with no lyrics is especially helpful as I am not tempted to sing along. If you picture me in front of the computer with Bohemian Rhapsody booming out, you would quickly realize that I would not be working. I would be concentrating too hard on the head bops and the proper falsetto.
It turns out that I am not alone in fnding that music helps me work. Countless studies have been done showing a definite co-relation between music and levels of concentration achieved while performing other tasks. The best-known of these is the Mozart effect and there are many websites devoted to the study of his music as it relates to an improvement in spatial reasoning.
To benefit, however, you don't have to listen to just Mozart. Any music that is upbeat can help to elevate your mood. It may not be the same music you would listen to in your leisure time, and the volume you listen at may not be the same either. You don't want the music to be invasive while you work, simply an added layer, and perhaps filter, to the other sounds around you.
Save the Bohemian Rhapsody for the shower. The acoustics are really great in there.