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→Harmony in 4ths and 5ths
Those Perfect 5ths are also called ''power chords'', which are a staple of rock and roll music. They might sound a little weird on the 1st and 2nd strings, but try playing around with that shape on the 5th and 6th strings!
=== Harmony in 3rds ===
Playing the 4th or 5th intervals on a melody line isn't very interesting - you almost always have a perfect 4th or 5th. Let's try 3rds: