Building off of this thread, I have a bit more to add from that Phantasy Star dojinshi published in 2018. TLDR: Sega of America first went to the Sonic 2 team and asked them to use music written in-house for the game. The Sonic 2 team was appalled at how bad the music was and strongly rejected it. After that, they were able to get Dreams Come True to do the music. Also, apparently Naoto Ohshima never knew that the Sonic CD music was changed for North America. So, in an interview conducted in 2017 and published in 2018 on the topic of Phantasy Star, Yasushi Yamaguchi (Judy Totoya), Naoto Ohshima, and Izuho Numata (Ippo) offered a few tidbits about Sonic history as well. I've translated the following excerpt concerning Sonic 2's music. Oh, and I should add a forewarning: Clearly Naoto Ohshima is confusing Michael Jackson's involvement in Sonic 2 with Sonic 3, so please refrain from spreading rumors that MJ worked on Sonic 2 In the interview, '--' and 'SST' refer to the interviewers. Observations: So I guess we have to add "rejected Sonic 2 music" to the list of things left to uncover? I wonder how all of this relates to SOA's desire to change the Sonic CD music. They seemed to have the belief that Americans wouldn't like the Japanese music. There also might have been pressure to make use of their own personnel since they were paying them. It's funny that Naoto Ohshima didn't know the Sonic CD music was changed. Does that just reflect on Ohshima himself, or did SOA just not tell anyone and changed it on their own? If the latter, that might explain why they could only change the redbook audio. Although I think it's clear Ohshima was confusing Michael Jackson's involvement with Sonic 3, Yamaguchi does say that he vaguely recalls MJ being mentioned during Sonic 2's development, so there might have been some tentative work on the partnership then.