If you make an application, let me know what it is.

MPMediaPropertyPredicate *predicate = [MPMediaPropertyPredicate predicateWithValue:[SongItem objectAtIndex:1] forProperty:MPMediaItemPropertyPersistentID];
MPMediaQuery *mySongQuery = [[MPMediaQuery alloc] init];
[mySongQuery addFilterPredicate: predicate];
[musicPlayer setQueueWithQuery:mySongQuery];
[musicPlayer play];

Works like a charm! Thanks for your input!!!!

for (MPMediaItem *song in itemsFromGenericQuery) {
songTitle = [song valueForProperty: MPMediaItemPropertyTitle];
[SongName addObject:songTitle];
songID = [song valueForProperty: MPMediaItemPropertyPersistentID];
[SongItem addObject:songID];
}

You are looping through an array of MPMediaItems (what you need to pass to the player), and you are then storing an array of song titles and an array of song IDs.

So you have two options:

1) Keep an array of the MPMediaItems
2) Use the MPMediaItemPropertyPersistentID of the MPMediaItems, to retrieve it at a later point. MPMediaPropertyPredicate should do that for you.

Any code example you you could provide would be deeply helpful.

Thanks ahead of time!

collectionWithItems: expects an array of MPMediaItems, not an array of MPMediaItemPropertyPersistentIDs.

self.musicPlayer = [MPMusicPlayerController applicationMusicPlayer];

MPMediaQuery *everything = [[MPMediaQuery alloc] init];
NSArray *itemsFromGenericQuery = [everything items];
SongName = [[NSMutableArray alloc] init];
SongItem = [[NSMutableArray alloc] init];
NSString *songTitle;
NSString *songID;
//Collect names & ID for entire music library & put into arrays
for (MPMediaItem *song in itemsFromGenericQuery) {
songTitle = [song valueForProperty: MPMediaItemPropertyTitle];
[SongName addObject:songTitle];
songID = [song valueForProperty: MPMediaItemPropertyPersistentID];
[SongItem addObject:songID];
}

NSLog (@”%@”, [SongName objectAtIndex:1]);
NSLog (@”%@”, [SongItem objectAtIndex:1]);
// Play the second song in the list
MPMediaItemCollection *collection = [MPMediaItemCollection collectionWithItems:[NSArray arrayWithObject:[SongItem objectAtIndex:1]]];
[self.musicPlayer setQueueWithItemCollection:collection];
[self.musicPlayer play];

If another application used the iPod to play music, that would work.