They’re the easiest instruments to sing and accompany yourself. That’s entirely impossible possible with brass or woodwinds. Percussion instruments aren’t usually tonal and even then they’re xylophones or something that takes a lot more set up than a guitar.
Guitar is a little special because it used to be a backup instrument where chords were the main thing. Then when it became electrified you could suddenly hear individual notes over a band. Then electric guitar companies started mass producing them and guitar became one of the most accessible instruments too.
Piano is also a little special because the layout is dictated by music theory. It’s the simplest way to arrange all the different possible notes in a way that it’s obvious what each note is based on its position relative to the other white or black keys. Because of that, when electronic instruments became a thing the instruments used piano key layouts. And then with electronics and computers becoming cheaper, cheap electronic keyboards become
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