Yeah, you can think of it that way.

[He tilts his head slightly at Alucard as he comments on his rapping, rubbing his chin in contemplation. He's obviously being silly in response, even if his face is mostly straight.]

Hmm. I am a master at karaoke...


[A short pause.]

...That's singing along to an instrumental track of a song, where it's missing the lyrics so you can sing instead.