For some, music can be energizing, for others, it can be relaxing. Depending upon which category you fall into it can make studying easier or more challenging. If the music is soft and soothing it can actually enhance the studying, however, if the music is full of lyrics and very upbeat it may be too distracting.
If you're reading or writing it can also present potential issues that can detract from what you're doing. Each situation is going to be different and it will be very dependent upon what sort of studying you're doing.