what happened on last panel? I didn’t really get what this last message meant and what Vinyl was trying to say

@BurstFire  
Thanks for the translation! I guess an upstart musician like Tavi knows the star powers of the Humane7 and wants a little piece of that herself

@Takengrin Endmmar
 
Artist is Japanese, so no, probably not. Nothing wrong with that, either.

@BurstFire  
Thanks, dude.

Poor Tavi :/

Electric cellos are nuts.
 
Oh and thanks BurstFire.

I don’t translate things a lot so the English version of this might sound a little odd, since it’s more or less directly what they’re saying in Japanese.
 
Octavia: What are you going to do about this, the jazz concert is tomorrow. All you can do is either reimburse me or go perform in my place.
 
Octavia: You’ll be the sax  
AJ: I can’t play something like this!
 
Octavia: You’ll be the trumpet  
RD: I can’t sing with this!
 
Octavia: Please play the piano.  
Rarity: Alright!  
AJ: That’s not fair!
 
Octavia: You’ll be this  
PP: Wee! Uh, what is this?
 
Octavia: You two will be on vocals.  
SS: Alright.  
FS: Um, I…
 
RD: Who will play the bass?  
Octavia: Me, of course!  
RD: Huh?
 
 
Octavia: Vinyl! From here on is the age of electric jazz!
 
RD: Is this just you wanting to brag about your new stuff?  
AJ: You shouldn’t have left your cello in the schoolyard to begin with.  
Rarity: Non-acoustic jazz isn’t jazz at all.  
Octavia: B- but, hey…
 
Octavia: Hey, let’s play some jazz-  
FS: We’ll definitely reimburse you.  
SS: We’re sorry.  
PP: Oooh
 
Text from Vinyl: Even with attempting trickery and persuasion, it was hopeless.

I’m quite receptive, But other than mane6 breaking Octavia cello, iv’e no idea what’s going on