Don’t want to be one of those know-it-alls… but still, page 7 of the workbook reads “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).” The “but” does not make sense. Could be more like “and higher”. Sorry for tripping over such a nitty gritty detail.
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Hi @mpcevat, and welcome to the forum! This has been addressed before: it’s a typo 
Thanks Marc
@FannyJustinGuitar Fanny, is this on a tick-list of corrections to make?
Thanks for flagging this @mpcevat! Yes, it’s on our log 
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