Polly by Nirvana is played in the key of Em at a beginner difficulty level, originally released in the 1990s. It uses 4 chords — Em G D A — arranged in the i-bVII-IV progression.
About the i-bVII-IV progression
The i-bVII-IV is a modal minor-key progression rooted in the natural minor scale. The bVII chord gives it a folk-rock modal quality that sits outside major-key expectations. You'll hear this shape in modern rock, indie folk, and the moodier Dylan/Stones catalogue.
Playing in the key of Em
E minor is arguably the easiest key on guitar. Em, G, C, D, Am, and Bm are its main chords, and everything but Bm sits open. Great for melancholy folk, moody rock, and beginner practice.
Related songs
More songs in the key of Em
More songs using the i-bVII-IV progression
Learn to play Polly by Nirvana on guitar. It sits in the key of Em and uses the i-bVII-IV progression with the chords Em G D A.