John Legend is one of those artists who makes our measure look almost absurd, and that is worth saying plainly. He is an EGOT winner, a celebrated soul singer and pianist with a long, acclaimed career and a shelf of awards. Nobody would call him a one-hit wonder in conversation.
Yet on streaming, one song towers over everything else he has done. "All of Me", the tender 2013 piano ballad written for his wife, became a wedding-playlist standard and a global number one, and it now sits near 3 billion plays.
His catalogue runs deep, and later songs like "Love Me Now" have found real audiences in the hundreds of millions. Even so, dividing "All of Me" by his second biggest track gives a ratio of about 7.2, past our 5.0 line.
So by our strict, numbers-only measure, John Legend registers as a certified one-hit wonder. It is the clearest possible illustration of what the label does and does not mean: it describes the shape of an artist's streams, not the breadth of their talent, and here one ballad simply dwarfs a distinguished body of work.