Working for /f script, but need filesizes

I received help before building a script that works great, but I'd like to amend the script to show file sizes of all of the *.mp3 that it finds.  

Here is the script(from billprew):

@echo off
REM Process each line (server name) from server text file
for /F %%A in (Servers3.txt) do (
  REM Find all MP3 files on this server and report it
  for /F "tokens=*" %%B in ('dir /s /a-d /b \\%%A\Data\*.mp3') do (
    echo %%A,%%B>>C:\Scripts\MP3.csv
  )
)

How would we get it to list file sizes of the MP3's it finds into the csv?

thanks!