How to Compare Charts From Different Eras Fairly
Launch library · evergreen read

Comparing chart performance across genuinely different eras is trickier than it first appears, since the underlying methodology, available formats and total audience size have all shifted considerably over time, making a simple side by side numerical comparison genuinely misleading if it is taken entirely at simple face value without further thought.
A fairer comparison usually looks at relative standing within each specific era instead of raw figures directly, asking how dominant a release was compared to its own genuine peers at the time rather than comparing it directly against a release from a completely different decade or an entirely different generation of listeners.
This relative approach will not satisfy everyone, since it deliberately avoids simple, direct numerical comparison, but it does produce a genuinely fairer picture of achievement across eras that measured very different things using very different methods and reflecting genuinely different technological realities of that particular time and place.