But remember, to be readable in an audio player the audio data must be in the first session as most can only see one session.
There are two legal forms of audio & data disc.
CD Extra puts the audio first and then the data on a 2nd session at the end - Used for hybrid CD's the same as you get in music stores for those enhanced audio discs.
Mixed-Mode CD puts the data into track 1 and the audio starts at track 2 - Used on game and data CD's. Not used on audio discs as a player could try and play the data leading to a very loud and distorted hiss from track 1.