to load zmv : 
<code>
autoload -U zmv
</code>

zmv is a module that allow people to do massive rename. 
The first option to know about zmv is the -n option that will show what will be done without being executed.

to rename a class music files which names are la like this : artist - album - track - title.ogg :
<code>
zmv '(*) - (*) - (*) - (*).ogg' '$1/$1 - $2/$1 - $2 - $3 - $3.ogg'
</code>
the "artist/artist - album/" repository should already exist the file will keep the same name and be moved to that repository.

to recursively do the same
<code>
zmv '(**/)(*) - (*) - (*) - (*).ogg' '$1/$2/$2 - $3/$2 - $3 - $4 - $5.ogg'
</code>

Of course we can use globbing. For example, rename all the avi files to replace _ by simple spaces, replace '.' by simple spaces lowercase the filename, and capitalise the first letter of each words : 
<code>
zmv '(*).avi' '${${(LC)1//./ }//_/ }.avi'
</code>

If you want case insensitivity pattern matching you can add (#i) at the begining of the first sentence for exemple
<code>
zmv '(#i)(*).avi' '${${(LC)1//./ }//_/ }.avi'
</code>
All files having for extenstions .avi or .Avi or .AVI or etc. will match and will be renamed as previously.

You can find more information here : http://strcat.de/zsh/#zmv