Another new load of PSP songs means more new IDs for future download packs!
The first ID,
chala, can easily call to mind CHA-LA-HEAD-CHA-LA, the famous opening theme of the Dragon Ball Z anime. The second one instead marks another entry for PSP DX's Game Music roster:
r4nak is the ID of Naked Glow, one of the latest Ridge Racer songs in Taiko games.