With the advent of multi-track recording came the ability to record additional tracks over already recorded tracks. Very often we start with the rhythm section (the instruments that carry the basic structure of the piece – the piano, bass, drums or the equivalent.) After those tracks are in place we can continue to overdubs. Subsequent tracks are added to the rhythm section to fill out the piece. Some artists have a set method for their overdub process. Usually the order is chosen to best support the final lead track (vocal or solo instrument.)