@guandms, if you “build” your own albums then you have little benefit from Picard or MusicBrainz. They are designed to match original released albums that you have purchased and ripped, to have them tagged correctly.
When you build your own albums for playback in Kodi, you should use a program like MediaMonkey, Mp3Tag og Foobar2000 to group songs into “albums” and tag them manually. Here’s what I do:
Album Name = Give the album a name that you like
Album Artist = Various Artists
Track # = 1…n (whatever order your choose. Don’t put more than 100 tracks in one album)
Title = Name of the song
Artist = Name of the artist playing (If more than one, separate them by semicolon or forward slash)
Then add an albumart of your liking, typically 500x500 jpg.
Tag the album as a compilation
Organise your albums in folders like this:
/Music/Various Artists/Album Name/track# - Artist name - Song Name.mp3 (or flc if you use flac)
Do not use APE tag format. Use ID3 v2.3 (Avoid 2.4 as Windows do not understand it)
Then tell Kodi to use embedded data when scanning your library and everything will show up nicely organised.
There is no point in feeding such “home made” albums to Picard cause it cannot provide much on an album level anyway. If you feed songs one-by-one to Picard, it will always try to match each song to an album from where it was ripped. Unless you want that information, it will only be confusing. If you do want it, it will be a tedious job if you have many songs.