Considering the creator/writer of the show is an extreme music/metal nerd (who writes and performs most of the tunage) there are actually tons of tongue in cheek music jokes scattered throughout scenes like that. I may be reading too much into some of the scenes but that particular one did make me gutlaugh because of the triplets (thwap bounce bounce) the first time I saw it.
 
My old bandmates (complete metal dorks) used to prattle on about it and I didn't get it but after watching the first few seasons I realized it is indeed awesome... although a little disturbing at times.

Maybe it takes an Alemprick bass.

Beepster
Considering the creator/writer of the show is an extreme music/metal nerd (who writes and performs most of the tunage) there are actually tons of tongue in cheek music jokes scattered throughout scenes like that. I may be reading too much into some of the scenes but that particular one did make me gutlaugh because of the triplets (thwap bounce bounce) the first time I saw it.
 
My old bandmates (complete metal dorks) used to prattle on about it and I didn't get it but after watching the first few seasons I realized it is indeed awesome... although a little disturbing at times.

 
Ah yes, you're correct there Beep - Brendan Small is the guy you're thinking about.
 
And I must admit, I am a big Dethklok fan
 
We don't get Metalocalypse on TV over here, but so far I have acquired the DVD set of Series 1, and also the three 'Dethalbum' CDs he's released.
 
I love the tongue-in-cheek approach they take to the TV show, and to the music, and although it's a parody of the genre, it's still excellent, and just as importantly - valid.
 
This superb video documentary (it's the bonus DVD disc in the deluxe version of Dethalbum III) provides a look behind the scenes at the recording process, including some interesting input from the guys who play bass and drums:
 

 
 
 
 
 

Wow - everything about that was brilliant!  And they even have Mike Keneally?  Nice!
 
Heck, if I could stand Cookie Monster vocals, I'd get some of their albums for sure.  The harmonizing guitars sound like Iron Maiden on steroids - lol.
 
I also would love to play as "bad" as Brendan.

craigb
Wow - everything about that was brilliant!  And they even have Mike Keneally?  Nice!
 
Heck, if I could stand Cookie Monster vocals, I'd get some of their albums for sure.  The harmonizing guitars sound like Iron Maiden on steroids - lol.
 
I also would love to play as "bad" as Brendan.

I'm a big Keneally fan.
 
I first saw him when Zappa did his last tour over here in the UK @ Birmingham NEC, and he's stayed with various incarnations of Zappa bands ever since. Great player.
 
Awesome bass there Steve - I actually like this stuff!

Hi,
 
Get the groupies ready ... that guy has bump!