For MacOSX I would recommend both Get Lyrical and TuneLyrics. I work them both together. If neither can get them, then TuneLyrics will help you find them. Sure, not 100% accuracy, but that is something you need to judge, especially by re-listening to the lyrics to be sure they match in those cases where there's some doubt.
With Get Lyrical you can select which songs you wish to check (multiple songs.) I usually check with this one first.