Basically they’re two of the most versatile and easily accessible instruments. They can be used to play nearly any type of music, and they don’t require you to learn a special technique to even get them to make a tone like brass or woodwind instruments do.
The piano is also the most conceptually-simple melodic instrument in my opinion. You have the entire grandstaff laid out in front of you, left-to-right, in half-step increments. This makes the piano *far* easier to understand than most other instruments.
On top of that, a guitar is one of the most affordable instruments to buy and doesn’t need much space to store, so essentially anyone who wants a guitar can have one.
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