I would like to ask if there any way for mass setting the YEAR Tag. It should grab the 1st matching result based on Artist and Title from discogs or similar?
The grouping criterion would be the album. Otherwise you have to touch each track individually anyway.
I don't know if there is a script around that only fills the field year. But you could modify existing ones until they only treat the field year.
As I said: you would have to adapt an existing script.
Or you try musicbrainz picard. That delivers at least some result in many cases. Not the most accurate one ... but if you want to get only the year anyway, it might be enough.