# LibrarySongFilter Song properties your app uses as a filter for a library request. ``` protocol LibrarySongFilter ``` ## Topics ### Instance Properties [`var albumTitle: String?`](/documentation/MusicKit/LibrarySongFilter/albumTitle) The title of the album the song appears on. [`var albums: MusicItemCollection?`](/documentation/MusicKit/LibrarySongFilter/albums) The song’s associated albums. [`var artistName: String?`](/documentation/MusicKit/LibrarySongFilter/artistName) The artist’s name. [`var artists: MusicItemCollection?`](/documentation/MusicKit/LibrarySongFilter/artists) The song’s associated artists. [`var composerName: String?`](/documentation/MusicKit/LibrarySongFilter/composerName) The name of the song’s composer. [`var genres: MusicItemCollection?`](/documentation/MusicKit/LibrarySongFilter/genres) The song’s associated genres. [`var id: MusicItemID`](/documentation/MusicKit/LibrarySongFilter/id) The unique identifier for the song. [`var title: String`](/documentation/MusicKit/LibrarySongFilter/title) The title of the song. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)