Watch the F to Dm Chord Connection online guitar lesson by Brad Carlton from Guitar Lab: Vertical Soloing
Bars four and five are F to Dm (IV vi). This is another example of two diatonic triads a third apart. Since the higher of the two is a major chord, this allows the use of the same pentatonic scale. Keep in mind that anytime you have a major chord and a minor chord three frets lower, this rule applies regarding the application of the pentatonic scale. This scenario occurs in three locations of the major scale diatonic harmony. They are: The I and vi chords, IV and ii chords, and the V and iii chords.