The Life Of Greather audio pack includes:

Greathers Quest - Original song used on the trailer and menu (1:16)

Greathers Quest (Alternate Extended) - Re-recorded and extended version. (1:56)

Greathers Instrumental (Re-recorded)- Music heard while exploring the world (1:09)

Waiting for you - New song that was recorded for the game prior to release, but never implemented. (1:39)

You will also get 12 audio files (voices), recorded for the game, but never implemented.

Can't i just access these in the game files?

Greathers Quest, the original song can be accessed in the game files, but in lower quality.

Greathers Instrumental can also be accessed in lower quality via the game files, but this has been re-recorded in higher quality for the audio pack.

All audio files are provided in WAV format.

Once purchased, You can access them via the game install folder under the new "AUDIO PACK" folder.