just mucking around with iTunes XML data..

loading_itunes_xml.m

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    NSString *path = [NSString stringWithFormat:@"%@/Music/iTunes/iTunes Library.xml", NSHomeDirectory()];
    NSData *xmlData;
    NSDictionary *plist;
    
    xmlData = [NSData dataWithContentsOfFile:path];
    
    NSString *error;
    NSPropertyListFormat format;
    
    plist = (NSDictionary *)[NSPropertyListSerialization propertyListFromData:xmlData
                                             mutabilityOption:NSPropertyListImmutable
                                                       format:&format
                                             errorDescription:&error];
    if(!plist){
        NSLog(@"Error: %@", error);
    } else {
        // Get tracks
        NSDictionary *tracks = [plist objectForKey:@"Tracks"];
        NSLog(@"Number of Tracks: %lu", [tracks count]);
        
        // Find all purchased albums!
        NSMutableSet *albumNames = [[NSMutableSet alloc] init];
        [tracks enumerateKeysAndObjectsWithOptions:NSEnumerationConcurrent
                                        usingBlock: ^(id key, NSDictionary *trackInfo, BOOL *stop) {
                                            if ([@"Purchased AAC audio file" isEqualTo:[trackInfo objectForKey:@"Kind"]]) {
                                                [albumNames addObject:[trackInfo objectForKey:@"Album"]];
                                            }
                                        }];
        
        NSLog(@"Number of Albums: %lu", [albumNames count]);
        
    }
}