I know that this picture pretty much confirms that I can't draw, but this is how it works....  Take a box and fill it with something (see below).  Tie the box with many different kinds of ribbon.  On each ribbon you put the title of a song.  As the children master that song, that individual ribbon is cut.  Once all of the songs are done well, they are able to see what's inside. 

What to put in the box:  If you have a theme, you can place an object inside the box that will tie everything together, or you can put a treat or small toy for each child.  This can be done over and over again as you place different objects or treats inside the box.