You mean four race musics including DIO'S THEME they left out of the first series. I never forgave them for that one. And they reused some in season 2 too. Sure, we got "Flying to Fly", except THAT'S NOT THE ONE IN THE ANIME. Sob.

From season 1, we're missing Dio's theme (the synth awesome version of Flying to Fly from when he chases Claus in his Starfish), the other synth music right after that when Lavie red-outs, the bird race music, and one of the Horizon Cave ones. From season 2 I think we're misssing two so far, I'll have to be an insane OST maniac watch the show some more to be sure. I wanted that music too. T_T

But yes, holy, this soundtrack is solid gold. My only true regret is that we didn't get the insane mix of all the battle tunes from the last episodes. But at least we got them individually!