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. What do you specifically need to do in order to play guitar better? Visit the GuitarMusicTheory.com website and click on the answer that best describes you. Get FREE custom video instruction calibrated to your current level.