Thanks for all the suggestions but I found one called Chronocalculator.
I already use all the suggestions you guys mentioned.... (ie, I'm not an imbecile)
I work in a recording studio 12 hours a day and don't have time to mess around converting minutes to seconds or dragging and dropping mp3's onto something like Rage in order to figure out the complete time. I needed something that takes up very little screen space, and very little RAM so that it's readily available to quickly add and subtract minutes and seconds for song lengths and calculate booked studio time.