[He nods and falls silent, doesn't say anything more, simply listening -- and, huh. Of course he'd heard Aramis humming to the Dauphin when the baby was still here, and maybe he hightailed it away mostly because how does one babies, but. This is the first time he's actually actively listened to his singing.]
... you know, your voice isn't that bad. ["It sounds nice", he means.] It's also making me want to fall asleep, but I guess that's... sort of the point?