Headcanon Corner: Musical Canon · 3:11pm Apr 8th, 2015
I'm sure most of you have seen the new Rainbow Rocks music videos making their rounds lately. If you haven't, well, here they are.
Why Hasbro is putting these out months after Rainbow Rocks made it to DVD, I have no idea. What I do know is that these music videos (with the exception of My Past is Not Today) aren't exactly canon insofar as they don't tie into anything that happens in the Rainbow Rocks movie (the same can be said for the music videos put out for Shake Your Tail and Perfect Day for Fun). However, while the scenarios aren't canon, I think the songs themselves can be.
Consider this: After the Battle of the Bands, Rainbow Dash probably lifted her embargo on songwriting and gave the other Rainbooms a chance to write their own material. Can't you just imagine Sunset Shimmer writing My Past is Not Today, or Rarity writing Life is a Runway? I know I can.
However, that's pretty much where the canon-ness ends. The only other way to make the videos canon is if the Rainbooms actually filmed these music videos themselves, and honestly, that's a bit of a stretch. Although now I have the image of a music video director trying desperately to teach Twilight how to play the piano for the Friendship Through the Ages music video stuck in my head. Seriously, that couldn't have been fun for him. 
This needs to be a story. Yesterday. Just label it AU and you won't have to worry about how non-canon it is.
And if it makes you feel any better, I get images in my head of Vinyl coming to the Rainbooms and saying, "Hey, I know this guy who can get us a recording deal. We just need more songs to pull it off."
And you're not the only one who thought of Rainbow going, "Okay, girls, we need songs, you need to write them. Go."
I... actually haven't seen these before; though yeah, I think your assumptions on canon-ness are about right, especially considering how most scenes in those MVs are in abstract locations anyway.
And just why is Rarity stomping through Pyroland in the Friendship Through the Ages? Crossover brooding ensues.
2964277 Rarity's scene is most likely a reference to the British Invasion more than anything, hence her Sergeant Pepper costume.