[docwra]

You are probably using the music video scraper that will indeed need a match to the song and artist to show up in the database.

The scraper needs a match for the exact artist - track on TheAudioDB metadata site. Then it will get all the nice artwork, info and tags.

The other option is just to use the files view.

I am using the default scraper - in fact, I am not sure where I can change that That's why I would love to be able to edit my Kodi databases with my PC, if there is such program and if that works in local network as well... For example, my movie library is inaccurate as well, as for example movie "Godfather 3" is now "3 Godfathers" in my library, and that seem to be a movie from 1948 Would like to correct these things! If there is better scraper to use, I would like to know it!

For Mediaportal, I used Mvcentral plugin and that had separate tool for scraping and correcting the database: for every entry that the scraper did not find match, I could either manually choose a match or just leave it blank - but in any case, all my videos showed up in Mediaportal. I wish this was possible in Kodi as well :/ For what it's worth, Mvcentral seems to use last.fm as primary source, and Discorgs as secondary source for matching.  

You can edit the database anytime with sqlite browser, but I would always try to fix things in Kodi first.

You can use NFO files to override bad matches, in the case of movies just put a text file in the movie folder with the IMDB link in it. It should then always match the correct movie. TVShows, Music videos and Music can also use NFO files to override any scraper choices.

http://kodi.wiki/view/NFO_files