One chord is fine. Two chords is pushing it. Three chords and you're into jazz.
"Rock & Roll is 10 % technique and 90% attitude. You can do more with one note and the right attitude than you can with fifty notes and no attitude. It's your delivery, how you deliver the package."
Making biscuits is like playing rock 'n roll. You only need three chords and a lot of volume.
—Good Eats "The Dough Also Rises" (The three 'chords' being flour, fat, and moisture.)
Joey Ramone is, sadly, now gone,
With him the Ramones are also no more,
But while he was here, Iím glad that he taught me,
You dont need ten chords when you can do it with four.
—Jay Pinkerton, Goodbye Poem to Joe Ramone