Duplicate Genres

[CANINE]

Hello,

I have a lot of music on my Jellyfin server and have noticed that some of my albums have the same kind of genre, but just differently named. For example, there's "Grunge", but also "Grunge Rock", which is essentially the same thing. 

Is there an easy way I can merge these without rewriting the metadata individually?

Thank you.

[tmsrxzar]

modify the tags in your files; that's where jellyfin got those from