Many common artists not matching on initial library load

Hi I’m new to Roon, I loaded a few folders a couple days ago and many familiar artists are not matching.

Some examples: Tom Waits, Pearl Jam, Paul Weller, Erasure, etc…

About half my artists are matching in Roon.

Thanks for any advice you can give on this process.

I see what’s going on – I initially loaded DVD rips and other esoteric stuff, once I loaded additional libraries with standard releases the artists started to match up.

Is there a way to manually match an artist in cases where I’m not finding a match?