Batch to move files from root folder into sub-folders

I have a root folder: C:UsersuseameDesktopNew folder which contains .mp3 files that are named like this:

20162406_3346_234958_97270791720411

20162305_3315_163017_97620734220699

I tried creating a batch that would sort them by the first 5-digits of the 4th series of numbers ( the 97270 or 97620 in this case) create folders named like that and then move all the files into their specific folder.

Here is what I've come up with:

@ECHO OFF

SETLOCAL ENABLEDELAYEDEXPANSION

set "sourcedir=C:UsersuseameDesktopNew folder"

for /f "tokens=1,2,3,4 delims=_" %%a in ('dir /b /a-d *_*_*_*.mp3') do (

set x= %%d

set y= !x:~1,5!

mkdir "!y!" 2>nul

move "%%a_%%b_%%c_%%d" "!y!"

)
endlocal

It works! but, I would like to know how to add text to the folder names, like have the created folder named:

97270 - Bla Bla Bla or

Bla Bla Bla - 97270

The 'Bla Bla" should not depend on anything taken from the file name, rather have it set by the user from withing the batch.

I have not managed to find the proper syntax for it.

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