Foundations
What Last.fm is actually measuring
Chartwave starts from scrobbles, not playlists, likes, or library saves. That matters because it means every chart is only as complete as the listening history Last.fm actually recorded.
Point 1
A scrobble is a logged play tied to your Last.fm account.
Point 2
If a listening session was not scrobbled correctly, Chartwave cannot reconstruct it later.
Point 3
Profiles with public history and steady scrobbling usually produce the clearest results.