Niko didn't look behind him until he heard the grunt and rustling in the tree. The kid looked comfortable enough up there (at least, it didn't look like he was going to slip or drop) so, with the extra distance, Niko was able to more easily ignore him. At least until he talked again.

Niko looked up at the kid, a bit dubiously. That was pretty retro; wasn't common for most kids that age to be into that stuff, let alone old foreign music. However, as if to reply, the next song transitioned to ELO's Ticket to the Moon. The lyrics came to mind, and he hummed it softly to himself:

'I've got a ticket to the moon
I'll be leaving here any day soon
Yeah, I've got a ticket to the moon
But I'd rather see the sunrise in your eyes.'

before he pulled himself out of his thoughts to ask, "That?"

If what the kid was asking was actually the latest single for an Anime or some shitty auto-tune crap or something, kid was out of luck.