Batch update "Genre" field only

I have a quite big mp3 collection now, but in the beginning, it was very small, and I was foolish enough to set the genre field to "Other" for all tracks. Artist, Album, Year, Title and Track fields is perfectly set, but "Genre" is set to "Other" for all tracks. Of course, I can update manually album by album, but I hope it’s possible to do this an easier way.

Here is a thread about a similar question about the field YEAR:

which links to