I have a hundred different groups. Many of them I have a hundred tracks. But I can't edit tags for many songs at once. So I create a lot of playlists, for example: "Trash Metal", "Alternative", "Death Metal", "80s". Although there is a genre button, but in the tags I have no genres, or they are listed incorrectly. So, I would like to choose several music groups as an example: Metallica, Megadeath, Exodus, Slayer etc. Select edit tags, and specify the genre that will be recorded in the tags of all songs in all groups. The same could be done with albums by selecting several albums of one year, and specify this year there, which will be recorded in all the songs of each of the albums.