Iwasaki wasn't happy about JoJo. He actually had to ask the staff of Warner to release this soundtrack on CD instead of bundling it with the BD/DVD like the first one. He felt his music was used poorly in the anime and that it made him feel like it was a wasted effort. It's safe to say he won't be working with them again any time soon.
Here's his full rant which he posted on Twitter back in March: