How do i add Voice and Music at the same time on windows movie maker ?

I am making a movie on windows movie maker ,

How do i add Music and my voice at the same time ? I know how to put music and voice in on its own but i want to know how i over lap it ? so i can fade voice and music in and out ? is this possible ? as i cant seem to work it out .

All i want to do is have Music playing while im talken about what im reviewing ! can anyone help ?

How do i add Voice and Music at the same time on windows movie maker ?uninstall internet explorer

.if you have sound recorder you could mix it and save it then import it to movie maker. play around with it and see.