I-IV-V major pentatonic scales

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Here's a tip if you already learned the Major scale.

I(Ionian)-IV(Lydian)-V(Mixolydian)

 

These three scales are all major scales and have a major pentatonic scale pattern in each.

 

So here's a rule of thumb

Play the V major pentatonic scale over the I,IV, and V major chord.

Play the I and V major pentatonic scale over the I major chord

 

page 236 in Jazz Theory by Mark Levine