you are likely to find Singer in/at/on Concert. Singer is a type of Musician. Musician is related to Theater. you are likely to find Seat in/at/on Theater. 
Material is related to Book. Book is related to Read. Read is the opposite of Writing. Writing is related to Signature. 
Concert <--AtLocation-- Singer --IsA--> Musician <--RelatedTo--> Theater <--AtLocation-- Seat 
Material <--RelatedTo--> Book <--RelatedTo--> Read <--Antonym--> Writing <--RelatedTo--> Signature 