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It does not tell you how to tune the harp. A harp must have a starting point on the strings usually at the 16th string (A) so a balanced tune can be achieved and avoiding braking string caused by incorrect tuning being too tight or too high of a note.
Sylvia Woods is a one-woman harp music enterprise, and quite successful at it. She starts this book off right, warning the student to play in proper form, placing groups of fingers on the strings before plucking that group as is taught by all competent harp teachers. So far so good. Then, in my opinion, she falls flat on her face: she writes each hand on its own staff (group of lines and spaces) as would properly be done, but she uses treble clef notation on each staff. Middle C, the note that divides the treble clef from the bass clef, is just below the physical middle on my 26 string harp. Almost half of my harp, a very modest sized harp, should be written in the bass clef. The upper staff should be treble clef notation, and the lower staff should be bass clef notation. For those who don't yet know it, the notes are not on the same lines and spaces in the two staves. The line that has a B note on it in the treble clef has a D note on it in the bass clef. I grew up reading treble clef music only (playing a flute, lowest note middle C) and am struggling to learn the bass clef. I don't need a book to reinforce my ignorance. Any harp sheet music is going to be written using the treble clef - bass clef system. My other harp beginner book, Mel Bay's Basic Harp for Beginners (available from Amazon) uses proper notation for the treble and bass clefs. It is very confusing to switch back and forth between the two books, and since one of them is doing it right and the other is doing it wrong I tend not to use this one. I don't need to learn things wrong just so later I can unlearn them.