Some songs have multiple tracks to choose from. You can preview the first 30 seconds of each track. Look at the "length" to see how long the recording is. See if I have added any "notes" about the track. "Notes" are found right below the song title, if there are any.
There are free exchanges. If you purchase any version of a song, you can email [email protected]
to request any other version of that song on the website. Tell us song title / key / length and we can add it to your account.