This is a common title for user-uploaded PDFs on file-sharing sites (like Scribd, Academia.edu, or blogspot), not a single published book by a major author (like Mel Bay or Hal Leonard). As a result, there is no single, standard review from a major publication.
I searched for a review of the specific PDF titled (All Harmonic Circles of the Guitar). todos los circulos armonicos de la guitarra pdf
This is a common title for user-uploaded PDFs on file-sharing sites (like Scribd, Academia.edu, or blogspot), not a single published book by a major author (like Mel Bay or Hal Leonard). As a result, there is no single, standard review from a major publication.
I searched for a review of the specific PDF titled (All Harmonic Circles of the Guitar).