Music Theory for the 21st-Century Classroom

It is rare to borrow from the major mode during a passage in a minor key. The major tonic usually functions as $\text{V}/\text{iv}$ if it’s not the last chord of a piece, and raised $\hat{6}$ and $\hat{7}$ occur naturally as part of the melodic minor scale.

In minor, the one place to borrow from the major mode is at the end of a piece in minor, with the use of the major $\text{I}$ chord instead of minor $\text{i}$.

While the Picardy 3rd (the major third above the tonic) was most commonly encountered in the Baroque era, it has been used from then until now, though with less frequency.