The Standardise Performer plugin is great.
(thanks @Sophist)
But I noticed one thing that could perhaps be improved upon.
When a track contains e.g. a guitar solo, the plugin will remove the guitar player from the ‘guitar’ role, and create a ‘solo’ entry for him.
But there the instrument is not showing anymore, so you will only see that the person played a solo, but not on what instrument.
It would be great if that could be addressed somehow.