Your question is difficult to understand. It is not clear what you are upto? which Music Maker version you are using?
By transfering music if you mean To record using Mic, in that case you have to connect mic then do some settings in Music Maker and also in windows control panel.
Or By transfering music if you mean To use your Pre recorded audio, from CD or Hard drive, use File Manager then browse when you find audio drag and drop on arranger. You can apply different effects too. Or even you can remix.