@interface MusicKit.LegacySectionedCollectionBackedPropertyProvider : _TtCs12_SwiftObject {
    void /* unknown type, empty encoding */ state;
    void /* unknown type, empty encoding */ lock;
    void /* unknown type, empty encoding */ existingCatalogItem;
    void /* unknown type, empty encoding */ typeValue;
    void /* unknown type, empty encoding */ requestedRelationships;
    void /* unknown type, empty encoding */ identifierSet;
}

@end