Put simply: They were more complete.
Spotify's library isn't even close to what WCD's was and is missing some copies of tracks/albums and/or just has the wrong versions flat out.
Spotify's library isn't even close to what WCD's was and is missing some copies of tracks/albums and/or just has the wrong versions flat out.
And the efforts of hundreds of thousands of engaged music fans who deleted bad tags, promoted good ones, made the connections.