Song Comparison

It would be amazing If I could play two songs at a time to see if I will be able to blend them together. A lot of times I need more than one song for a project and Ill open up two different pages on my web browser so I can play the end of one and the beginning of another to see if they match up. It would be cool if you could make this a feature where I can put them into some sort of playlist and play them at the same time wherever I want to in the song to see if they match up the way I want them to.