User blog comment:Miskos3/Fairy Tail Episode 248: Tartaros arc: Attack of the Celestials, Review/@comment-7418318-20150829093931/@comment-96.255.231.61-20150829165820

@Miskos3 I doubt the soundtracks are solely copyrighted to Satelight, as A-1 Pictures has been the main studio both times, and it's the same composer. If it was a matter of copyright, even remixes would be an issue in that case. A-1 could probably reuse the old soundtracks if they wanted to. I'm guessing they don't because if they reused them now, Satelight would be due some money for their use, either contractually, or due to a jointly held copyright. New tracks avoid having to share any profits with a studio that's no longer involved.