Correct answer:
aburre
Aburre is the conjugation of the verb aburrir that matches the third person singular in the simple present. This verb can be translated into boring or bored according to the context of the sentence. Here we use the word boring because it refers to a situation that in fact it's boring. So this sentence can be written and translated as follows:
No me gusta ir a los conciertos porque me aburre la música (I don't like to go to concerts because I think music is boring)
