This was originally going to be a Twilight Sparkle video, but then I thought about it and realized that of all the main cast, Rarity seems to be the one who takes her work the most seriously.
The song and the some of the style of the video are drawn from the opening titles of BBC's Chef! It is very amusing; I highly recommend it.

Thanks to Equestria Daily: http://www.equestriadaily.com/2013/04/simple-pmv-20.html
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My Little Pony: Friendship is Magic is © Hasbro, all art/writing is © to their respective artists.
Serious Profession performed by Omar, © the BBC
Video is legal under fair use:

~FAIR USE~ Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use.