How to use only one song from the iPod app library?

There is a library for functions with iPod . The item you are going to need is the MPMediaItem that is the music itself and when using the valueForProperty: method you get some properties that can be stored as the "note" you need and use it to get it back. I'm not sure if it's possible to store MPMediaItem itself.

An example that is in the documentation itself:

MPMediaQuery *everything = [[MPMediaQuery alloc] init];
NSArray *itemsFromGenericQuery = [everything items];

for (MPMediaItem *song in itemsFromGenericQuery) {
    NSString *songTitle = [song valueForProperty: MPMediaItemPropertyTitle];
    NSLog (@"%@", songTitle);
}

And there's the possibility to include predicate to filter, or if you prefer, you have Media Picker , which functions as a selector.