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In Audacity, you will see the music on both timelines, so when you play the file your actually playing both at the same time.
You need to remove one of the music tracks in the timeline, and the other will play correctly.
This shows how you combine two songs, which is what you have done and want to undohttps://www.youtube.com/watch?v=gcT-R4Vu5-I
You can also get all the manuals and tutorials herehttp://audacity.sourceforge.net/help/documentation
But the problem you have at the moment is that your playing both songs in the one track, so you need to remove one of them.
If you have continued problems, or would like any additional information or assistance, please do not hesitate to let me know.
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