Here’s a great concept to embellish the sound of a IV chord in a progression. In addition, try experimenting with this approach on any major chord you may come across, even the I chord, depending on the type of sound you’re going for. Let your ear be the guide. The scale being used here is called Lydian, which is closely related to the major scale.
Some tunes use this scale on the I chord for an especially fresh sound!
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