What does 'down a minor third from the major key' mean?
Going down a minor third from the major key applies to all instruments but it's easiest to show on a piano, as follows:
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-1.4df6ee6.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-2.d516bb3.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-1.b0b0513.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-2.f89189d.jpg)
Going down a minor third from the major key applies to all instruments but it's easiest to show on a piano, as follows: