With the MP3 transposer, you can change the key of an MP3 so that your musicians can hear the song in the key they will be performing it, while maintaining the original tempo of the song.  

To transpose an MP3, Planners can log in to their account, and should see a music note icon for transposing the MP3 from 3 different places:

Once the transpose process is done (which could take a minute or so), a new MP3 file will appear in your list of Files, and it will have a modified name to indicate how it was transposed.