I like this headcannon but with me there both from canterlot and close to live in ponyville dew to the simpleness of the town

That’d mean Octavia got her dream in this ending (which would be a powerful motivation for her to bear living in a hick town with a DJ) because in MY headcanon (sparked completely by a throwaway line in Epic Wub Time, I guess) being in the Canterlot Orchestra is like, Rainbow Dash and the Wonderbolts with her?  
From what we know from the show, she actually has her own band of 4 that she plays background music with at events and stuff (like we saw at the Gala).  
But it’s kind of questionable if she IS in the Orchestra in Canterlot then why she doesn’t just LIVE in Canterlot?
 
I’m actually not sure what either of them are doing in Ponyville (other than it making it much easier to include them in stories this way), because Octy looks like the type who’d rather be in Canterlot and Vinyl’s heart would probably beat for Trottingham as in the biggest most modern city as of yet. It’s hard to imagine why either of them would willingly stay in a backwater town like this.  
Yes, they have a princess castle now but that really doesn’t matter, what matters is that they don’t have any of the infrasructure, the audience, the professionals, the rivals, the equipment.  
So I can kind of picture some sort of special princess deal being behind all this (I mean the Princesses have awfully taken to participating in Ponyville only events recently :p).

I have the distinct feeling that OP isn’t really a duck.

Not a bad headcanon, all things considered. Not all that profound either, but still ;)
 
@Background Pony #F50E  
Lazy fuck

TLDR