Thanks izzy! I actually finished Ys III years ago on the Genesis, loved that one too. I might have to revisit it after I'm done with I & II. Btw the cave music is easily my favorite from Book I. Just...awesome.
If you like Ys III then definitely check out Ys Oath In Felghana. It is an excellent remake and retelling of Ys III. It's on Steam and PSP. The Steam version is the original version of Oath optimized for today's computers while the PSP version is portable and has extras. Both versions are excellent.
His videos about Ys has been pretty awesome. It's one of the reasons why I subscribed to him. He definitely has some great tastes in games, and his coverage of older games go beyond the Nintendo consoles.