An altered chord is like a special kind of chord that sounds different from normal chords. It's like adding some new flavors to your ice cream!
When a musician plays an altered chord, they change some of the notes in the chord to make it sound more interesting. Imagine you have a toy car, but you switch out the wheels for bigger or smaller ones - the car will look and move differently!
Normally, when someone plays a chord on a piano or guitar, they use the same notes that are in the scale they're playing in. But with an altered chord, they might change some of the notes to make it sound more interesting.
For example, let's say you have a normal chord with the notes C, E, and G. If you alter this chord, you might change the E to an E-flat or the G to a G-sharp. This gives the chord a different sound that can make your ears perk up!
Altered chords can be used in all kinds of music, from jazz to rock to pop. They're like a secret ingredient that musicians use to make their music even more special. So next time you listen to a song and it has a really cool chord that sounds different from the rest, it might just be an altered chord!