So I was thinking, Stardust Crusaders takes place in 1987, and the anime has the ending theme of Walk like an Egyptian, the number one best selling pop rock song of 1987… Using this information, I did reasearch onto the most popular pop/rock song of 1999 (the year JJBA part 4 takes place) and I think I was able to accurately predict what the ending theme will be to Jojo’s Bizarre Adventure Part IV: Diamond is Unbreakable.