Audacity - Merge Audio, Mp3

Download and install Audacity, a sound manipulation program.

2

Load Audacity.

3

Open the songs you want to combine.

4

Select (highlight) the waves you see in the second song.

5

Go to Edit - Copy (or press CTRL-C)

6

Position your cursor after the waves you see in the first song.

7

Go to "Edit - Paste" (or press CTRL-V)

8

Go to "File - Export as MP3".

9

Fill in the fields (this is optional).

10. Wait until it is complete

 

Source: http://www.wikihow.com/Combine-Songs-on-Your-Computer-Using-Audacity