A recent change to iTunes took away the Genre column from the browser (Command+B) while viewing your library in list view. You can add that column back if you like, by going to the Terminal application and typing:
defaults write com.apple.itunes show-genre-when-browsing -bool TRUE
Related: Get Safari To Open Tabs Instead of Windows, How to remove track numbers from library?, iTunes Library Columns, MacMost Now 159: Using Data Detectors, Tabbed Browsing in Safari.
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