Impossible to give this a star rating. Not knowing the original Finnish songs (never mind not knowing Finnish well enough to understand those old folk songs), I'm not sure how good the translation is or the veracity of the interpretations here.
I absolutely appreciate the attempt made to preserve an ancient pagan tradition, however, this tome is not untouched by Christianity. I struggle to believe original pagan magic songs mentioned Jesus and the Virgin Mary, so these are definitely the result of later influences or perhaps a result of fallible human interpretation.
This book does, however, provide greater insight into the various deities and creatures of Finnish mythology, adding snippets of detail and providing some contrasting interpretations of the various characters.
What I appreciated the most, perhaps, was the presentation and analysis of the similes and metaphors used in the original text (I say text, but these songs were largely shared in the oral tradition until outsiders tried to collect and collate them) - better to say in the original language. There are some truly astounding turns of phrase here that provide insight into Finnish thinking and world-views. Again, some of this is tainted by Christianity with the literal demonization of certain creatures :(
Despite knowing quite a bit about Finnish mythology and folklore (or so I thought) I definitely learned a lot here, not least of all about the culture of magic songs and how indelibly music was/is tied to Finnish traditions.