What do the songs "Brown Eyed Girl" by Van Morrison, "Hot Blooded" by Foreigner, and "Sweet Child O' Mine" by Guns N' Roses have in common?

They all make use of a perfect 4th interval over the IV chord.

Why do you need to know this? Because it's a common composition technique used in popular music and it helps you understand why songs often contain notes that are out of key.

I explain all the details and play through examples in today's podcast episode.

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