Nirvana & Borrowed Chords
Nirvana's unique usage of simple power chords allowed them to create complex, unforgettable melodies. More than that Kurt, without any theoretical knowledge, pulled harmony and melody from outside diatonic keys.
This video goes in-depth on Lithium to demonstrate how borrowed chords are used to create harmonic and melodic interest.
If you want to learn how you can use relative and borrowed chords please check out my FREE Songwriting Chord Kit