Considering the time and place Diarmuid is from, magic is always a good guess.

"I do! I do!" Diarmuid jumps up and down excitedly, "At least for music. I don't really watch movies." The boy turns to point toward the end of the block and across the street, "There is a store down there that has actual music instruments if you want them to play around with and..." he spins around until he is pointing in the opposite direction, "...there is a shop that has lots of round things in it down there. The person inside said they hold music and are called CDs. I don't know how they work. Do you know?"