Possible APP or program to Attach Album Art jpg to MP3s

Hi,
I have something in the order of 50 to 60Gb of MP3s. They follow a very strict directory structure on my PC i.e.

01 General Music
01 Album 1
02 Album 2

02 English Music (All these are personal recordings no no search Apps will work)
01 Album 1
02 Album 2

I have dropped an image in every directory and I use to have an Archos which displayed the image from the directory on the 250Gb Hard drive.
Since then I have purchased a Samsung Note 3 phone and Tablet which exhibit the problem of not displaying the Album Art from the directory be it the phone or Tablet.

Does anyone know of any APP that can embed the Album Art into the MP3 from the jpg image file in the directory ?

Any help would be appreciated otherwise I fear going back to Archos which only runs Android 2.1 instead of 4.4.
Thanks in advance.