Adding Our song over the top of the footage

We found the music that we are using on a music download site, we then downloaded the music on to Emma's USB. From their we saved the music into our file on the mac. We then made a cope of the music and added this to our footage on final cut. We then made sure that we saved this so we don't lose anything. However we are having trouble finding away of playing the music on final cut, as when we try this now, we do not hear anything, we are also finding it hard to brag the music down onto the footage, but this problem will be solved soon, as we find out other things about how final cut works.