Maybe my speed is causing confusion - I permuted the result:
This is the result:
Artist = Eric
Album = Clapton Backless
Track# = 04
Title = Roll It
I would like it to be:
Artist = Eric Clapton
Album = Backless
Track# = 04
Title = Roll It
When you mentioned the file that is on my old CD
Eric Clapton Backless - 04. Roll It.mp3
I want to switch to HD and then arrange the tags in the described way.
The problem is that I don't know how to combine 2 strings into one (Eric+Clapton) because I don't have a character to separate ( - , . or similar).
If you're not kidding me, I think I've explained my pain well 
Without a defined separator, this is pretty complicated to automate. There are so many possible patterns that could exist with a large batch of files. What if the Artist has just one name, like Cher? Or three or more names like Creedence Clearwater Revival? It gets further complicated by punctuation like Earth, Wind & Fire. So while it may seem like a quick fix, you could end up causing a whole lot of worse issues to fix instead.
How many songs are you trying to fix like this? It may be more efficient to simply do one album at a time.