Here they are:

Music from Ys I & II Chronicles (Original Mode) (http://itunes.apple.com/jp/album/music-from-ys-i-ii-chronicles/id336993749)
Music from Ys I & II Chronicles (PC-88 Mode) (http://itunes.apple.com/jp/album/music-from-ys-i-ii-chronicles/id336873613)
Recollection of Ys Vol.1 (http://itunes.apple.com/jp/album/id214202552)
Recollection of Ys Vol.2 (http://itunes.apple.com/jp/album/id213377818)

Also, a PSP rip of Oath in Felghana is appreciated.