Having brutally murdered (and occasionally been brutally murdered by) quite a few of the game's bosses by this point, I feel the need to point out one gripe I have (really always had) with the TGCD version of the game... why do the Ys II bosses keep using the Ys I boss music? Was there not enough space on the disc for it, or did Hudson and Falcom just not have enough of a budget to pay Yonemitsu for a Protectors arrangement?
Whatever the case, we technically DO have a TGCD-style arrangement of the theme in Perfect Collection Ys II by the man himself - you could think of it like a sound of what could've been:
https://youtu.be/eSVBY5o0zbc