Program to compare lists of folders?

[JGB]

basically I have folders with hundreds of folders in each. I want to compare and combine the folders that are the same in both.
Any program that can do this? I found one called twin browser but I can't find a not a shitty trial version version.

[yevgeny]

directory opus is a good explorer replacement. ive tried the other ones i prefer this one because it totally replaces explorer including control panel and trash etc which arent normal folders. it has a dual vertical layout to manage large amounts of files in the one folder.

[JGB]

Ok. Basically I'm hoping to not do it manually do it. I'm comparing two folders with hundreds of folders(artist names) I want to look in folder A and B, and have it highlight or automatically merge into folder B any folder that has the same name.
EDIT: if it makes it clearer, I want to compare for example my Main folder and my Rock folder, and merge into the rock folder any folder in Main that have the same artist names. So I have all of their songs in one location.