Cyril, I checked the Workbook (re-downloaded), it is properly updated as mentioned by Richard @Richard_close2u. 
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every time i check this topic i feel like being back at school in physics or maths
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Deborah @GrumpyMac
I know what you mean but I like the science behind these sort of things.
Michael
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Hi Lisa, 
I am talking about the change he mentioned today at 9:59am.
The new lesson page:
Practical Perspectives
Guitars only play notes between 80Hz to 1.31kHz. ** The second thickest string on the guitar is the note A, whose frequency is 110 Hz. Piano goes lower and higher (down to 27.5 Hz and up to 4.18 kHz (4180 Hz) on an 88 key piano) .
** NOTE: There is an error in the video - it is stated and written that the highest pitch on guitar is 7kHz. This is an error.
The content of PMT v2:
Practical Perspectives
Guitars only play notes between 80 Hz to 1.31 kHz. The second thickest
string on the guitar is the note A, whose frequency is 110 Hz. Piano goes
lower, down to 27.5 Hz, but not as high, only up to 4.18 kHz (4180 Hz).
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Hi Cyril,
aaah, now I got your point correctly and yes, you are definitely right. My bad.
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no problem
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Wowzers what a debate.
So as far as fundamentals go the frequency is a nowhere near 5k.
But I know editing in the studio that important frequencies exist from the guitar way above thatā¦ we are into harmonics and overtones - but they play a massive part of the sound we hear.
Just as it shows in the video when I play a not on piano the spectrum analyser shows many notes above the note played.
So thatās where I got the figure - didnāt think it would cause so much controversy and outrage lol.
Iāll see if I can tweak the video to clarify, but unlikely to be right away as I have other fish to fry right now! J
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Maybe one reason so many of us older folks turn to guitar is that they play in frequency ranges we can still hearā¦
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In the Practical Music Guide on page 7 it says, āGuitars only play notes between 80 Hz to 1.31 kHz. The second thickest string on the guitar is the note A, whose frequency is 110 Hz. Piano goes lower, down to 27.5 Hz, but not as high, only up to 4.18 kHz (4180 Hz).ā According to this a guitar can play a note at 1310 Hz which is lower than a pianoās at 4180 Hz so why does it say ānot as high.ā Am I reading this wrong?
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Hi Gary,
See this post above
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Hi Jozsef,
Thanks for your response. After I posted my question, I did get access to this whole thread in which this topic has been discussed extensively. I see that the original Workbook stated the guitar went as high as 7kHz and Justin clarified that he was using a frequency analyzer that picked up harmonics and overtones. The workbook has since been corrected to indicate the upper threshold of 1.31kHz for a guitar.
I should just drop it and move on, however, the wording on page 7 for future readers is still going to be confusing: āPiano goes lower, down to 27.5 Hz, but not as high, only up to 4.18 kHz (4180 Hz).ā This wording makes sense when the upper threshold was written as 7kHz but now that itās corrected to 1.31khz, it is confusing. Just trying to help others not fall into this rabbit hole.
Okay, wait, the post that you pointed me to refers to a ānew lesson pageā with corrected wording of āPiano goes lower and higher (down to 27.5 Hz and up to 4.18 kHz (4180 Hz) on an 88 key piano) .ā Where is that new lesson page located?
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Itās in the notes beneath this lesson
Thank you, LadyoftheCastle!
At some point, editing the workbook and putting a banner in the video with the correction will make a difference for those among us who āfreak outā over contradiction! 
The good news is the JG community clearly is there to support one another and the responses were quick and helpful.
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Hi
Iām going through some older lessons to see what I need to review. I see 2 different versions of the e-book for this PMT - Grade 1
I have two downloaded versions:
JG-PMT-Grade1-Worbook-v2.pdf
and
JG-PMT-Grade1-Worbook-Digital-v04 - this is a digital version where you can fill in the pdf
The quizzes are slightly different, but not that matters much. But, it can be confusing.
Unless I am mistaken or confusing lessons,
The only download I see in the Resources tab for this lesson is the Workbook-v2
I donāt remember where I found the Digital-v04 version.
Perhaps someone can check and add the digital version to the Resources and remove the older version. I assume the digital version is the current, correct version.
Thanks
Andrew
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@Andrewjm
Hi there Andrew, hope things are good with you.
I canāt find version 04 anywhere. I wonder if it was a temporary version while v1 was updated to v2.
Tagging @FannyJustinGuitar
Yes, I believe v4 was temporary (or the name may have been changed)! The versions currently available on the website are the correct ones.
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Hi
Thank you for the replies. I think there is still some sort of discrepancy.
The download on this link/page is a non-digital version
https://www.justinguitar.com/guitar-lessons/pmt-workbook-grade-1-mt-000#resources
However, the following workbooks are all pdf-digital
JG-PMT-Grade1-Worbook-Digital-v04.pdf
JG-PMT-Grade2-Worbook-Digital-v02.pdf
JG-PMT-Grade3-Worbook-Digital-v03.pdf
I also have these versions
Practical Music Theory Grade 1 Exam.pdf - it is digital
Practical Music Theory Grade 1 - Answers.pdf
Practical Music Theory - Grade 1 -Worbook v03.pdf - digital
I think the ones I marked in bold are the matching ones for the lessons/modules, but I am not 100% sure
They are all different workbooks/files. Unfortunately, I cannot attach them for you to be able to sort and organize them.
And, are there workbooks/tests/online tests for Grades 5, 6, 7? I do not see anything.
Thank you, stay well
Andrew
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Hi Justin, in grade one about the differences between frequencies of notes from guitar and piano, you write that piano goes lower, but not as high as guitar. You write. however, that piano goes up to 4.18 kHz and guitar goes up to 1.31 kHz. But isnāt 4.18 kHz higher than 1.31 kHz? So piano has on both sides a higher range in frequencies? Hope to hear from you. Best, Miriam
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Hi Miriam, if you take a look at the notes beneath the video, youāll read this:
āGuitars only play notes between 80Hz to 1.31kHz.** The second thickest string on the guitar is the note A, whose frequency is 110 Hz. Piano goes lower and higher (down to 27.5 Hz and up to 4.18 kHz (4180 Hz) on an 88 key piano) .ā
** NOTE: There is an error in the video - it is stated and written that the highest pitch on guitar is 7kHz. This is an error.ā
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