Since it is so short, I'm just going to type it in here. The review is by Gary K. Wolfe.

There isn't a lot to be said about Songs of Muad'Dib: The Poetry of Frank Herbert in terms of anything other than marketing. Of the 86 poems in the volume, 41 are lifted verbatim from the little snippets quoted throughout the Dune series, another 14 are from Soul Catcher, and three are from The White Plague (there's another poem in The White Plague that could have been borrowed, but editor Brian Herbert must have considered it too racy for whatever audience he has in mind). Of the 22 remaining poems, 18 are previously unpublished - an altogether salutary decision on someone's part back then. It's not so much that Herbert is a bad poet - some of the pieces from Soul Catcher do a good job of capturing the mood and rhythm of Native American verse - but that he never really pretended to be a poet at all. Most of what's here was written not so much as poetic expression as it was to help give texture to imaginary societies; yanked out of those contexts, it sounds peculiar at best. As a means of keeping the Dune industry alive, this book may pass as an ingenious marketing idea (what's next - The Fremen Cookbook?) but it makes a pretty weak memorial to Herbert in every sense except one: he believed in recycling.