我怎样才能为两个不同的类使用predicateWithFormat

i need to imlement search with to different class ons is Song and the other one is Album. etch one of them is represent song/album with his property (name,url,etc..). now i am using this code to search song from my songArray by searching the name property, i need to also be able to search in the albumArray, also in the name property. i need to imlement search with to different cla