The music in The Earth Defend and Legend of Wukong was done by a fellow named Ya-min Hsu-- or, as the latter's Chinese credits render it, 許雅民.
So I decided, as usual, to search for those Chinese characters.
What I found was... rather unexpected.
I guess
this biographical sketch (
Google translation) is of the same guy? Same exact characters, and... well, he's definitely a composer.
I'm curious what the chances are that two Taiwanese musicians would share the exact same name. Oddly, the only hit I can find mentioning both this guy's name and 悟空外傳 (Legend of Wukong) is taizou's GM-95 page!