Chords

When you play at least 3 notes together, you've made a chord. They're often made of notes a skip apart, like this:

Sometimes they have different shapes (inversions):

The most common are major and minor - can you tell the difference between the sounds of these? (people often say major sounds 'happy', minor sounds 'sad').

Then, there's a whole range of other chords, eg: sevenths, diminished or augmented, suspended (sus) and more...

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Here's a video showing some common chords: