The Songwriter data we show on Artist pages is delivered from the Mechanical Licensing Collective (MLC).
Only the rights holders that are MLC members can make updates to existing songs.
In turn The MLC will only make updates upon instructions from their Members.
There are a number of ways they can do that including The MLC Portal via the Work Registration wizard or the Bulk Upload template.
We cannot update the data on Chartmetric as this data comes directly from the MLC. To make updates please submit corrections directly through The MLC website at https://themlc.com.