The mini-OST that came with the physical collector's edition only had 6 songs on it. The main city-states tracks (daytime music only) and the areas outside them (The Black Shroud, Thanalan, La Noscea). If you upgrade from basic to collector's edition DIGITALLY, you DO NOT get the soundtrack at all, only the downloadable items/mount. If you want the music, you will have to order the OST by itself.

Be warned about buying the ARR soundtrack. When I got mine, I put in the Wind-Up Bahamut code and my code was already used. So I spent money on the soundtrack to also get the minion, yet I couldn't. This means I would have to fork over $56 dollars (that's with tax and shipping/handling) just to get the digital minion. Be careful when you order it, as I said. I bought it from the Square-Enix store, too.