Here are the classes, structs, unions and interfaces with brief descriptions:

coverart_browser_prefs.CoverLocale.__impl
coverart_browser_prefs.GSetting.__impl
coverart_rb3compat.ApplicationShell.__impl
coverart_browser_source.Views._impl
coverart_utils.Theme._impl
coverart_widgets.AbstractView
coverart_rb3compat.Action
coverart_rb3compat.ActionGroup
coverart_album.Album
coverart_covericonview.AlbumArtCellArea
coverart_album.AlbumCoverManager
coverart_artistinfo.AlbumDataSource
coverart_album.AlbumFilters
coverart_artistinfo.AlbumInfoView
coverart_album.AlbumLoader
coverart_album.AlbumManager
coverart_controllers.AlbumQuickSearchController
coverart_controllers.AlbumSearchEntryController
coverart_covericonview.AlbumShowingPolicy
coverart_album.AlbumsModel
coverart_rb3compat.ApplicationShell
coverart_artistview.Artist
coverart_artistview.ArtistCellRenderer
coverart_artistview.ArtistCoverManager
coverart_artistinfo.ArtistDataSource
coverart_artistinfo.ArtistInfoPane
coverart_artistinfo.ArtistInfoView
coverart_artistinfo.ArtistInfoWebView
coverart_artistview.ArtistLoader
coverart_artistview.ArtistManager
coverart_artistview.ArtistShowingPolicy
coverart_artistview.ArtistsModel
coverart_controllers.ArtistSortOrderToggleController
coverart_controllers.ArtistSortPopupController
coverart_artistview.ArtistView
coverart_artistinfo.BaseInfoView
coverart_entryview.BaseView
coverart_utils.CaseInsensitiveDict
coverart_covericonview.CellRendererThumb
coverart_utils.ConfiguredSpriteSheet
coverart_album.Cover
coverart_browser.CoverArtBrowserEntryType
coverart_browser.CoverArtBrowserPlugin
coverart_browser_source.CoverArtBrowserSource
coverart_entryview.CoverArtCompactEntryView
coverart_entryview.CoverArtEntryView
coverart_export.CoverArtExport
coverart_play_source.CoverArtPlayEntryView
coverart_play_source.CoverArtPlaySource
coverart_coverflowview.CoverFlowView
coverart_covericonview.CoverIconView
coverart_browser_prefs.CoverLocale
coverart_album.CoverManager
coverart_album.CoverRequester
coverart_search.CoverSearchPane
coverart_external_plugins.CreateExternalPluginMenu
coverart_browser_source.CustomStatusBar
coverart_controllers.DecadePopupController
coverart_artistinfo.EchoArtistDataSource
coverart_artistinfo.EchoArtistInfoView
coverart_playlists.EchoNestGenrePlaylist
coverart_playlists.EchoNestPlaylist
coverart_widgets.EnhancedButton
coverart_widgets.EnhancedIconView
coverart_entryview.EntryViewPane
coverart_external_plugins.ExternalPlugin
coverart_browser.ExternalPluginMenu
coverart_utils.FauxTb
coverart_coverflowview.FlowControl
coverart_coverflowview.FlowShowingPolicy
coverart_utils.GenreConfiguredSpriteSheet
coverart_controllers.GenrePopupController
coverart_browser_prefs.GSetting
coverart_utils.IdleCallIterator
coverart_widgets.ImageRadioButton
coverart_widgets.ImageToggleButton
coverart_playlists.LastFMTrackPlaylist
coverart_toolbar.LeftToolbar
coverart_artistinfo.LinksDataSource
coverart_listview.ListShowingPolicy
coverart_listview.ListView
coverart_widgets.ListViewButton
coverart_rb3compat.Menu
coverart_widgets.MenuButton
coverart_utils.NaturalString
coverart_controllers.OptionsController
coverart_widgets.OptionsListViewWidget
coverart_widgets.OptionsPopupWidget
coverart_widgets.OptionsWidget
coverart_widgets.PanedCollapsible
coverart_widgets.PixbufButton
coverart_controllers.PlaylistPopupController
coverart_playsourceview.PlaySourceShowingPolicy
coverart_playsourceview.PlaySourceView
coverart_widgets.PopupButton
coverart_browser_prefs.Preferences
coverart_controllers.PropertiesMenuController
coverart_widgets.ProxyPopupButton
coverart_queueview.QueueShowingPolicy
coverart_queueview.QueueView
coverart_widgets.QuickSearchEntry
stars.ReactiveStar
coverart_entryview.ResultsGrid
coverart_utils.ReversedSortedCollection
coverart_toolbar.RightToolbar
coverart_widgets.SearchEntry
coverart_album.Shadow
coverart_album.ShadowedCover
stars.ShapeStar
coverart_utils.SortedCollection
coverart_controllers.SortOrderToggleController
coverart_controllers.SortPopupController
coverart_browser_source.SourceStatusBar
coverart_utils.SpriteSheet
stars.Star
stars.StarFillState
stars.StarRatingsWidget
stars.StarRenderer
stars.StarRenderHints
stars.StarSize
coverart_browser_source.Statusbar
em.StockEms
coverart_album.TextManager
coverart_widgets.TextPopupButton
coverart_utils.Theme
coverart_toolbar.Toolbar
coverart_toolbar.ToolbarManager
coverart_toolbar.ToolbarObject
coverart_toolbar.TopToolbar
coverart_album.Track
coverart_controllers.ViewController
coverart_browser_source.ViewManager
coverart_browser_source.Views
coverart_playlists.WebPlaylist