Pinkie Pie had promised a Party, and now a Concert, you would never forgive yourself for missing. She omitted the details about as to who was playing, as well as what they were playing. While everyone knew her as a Wizard on the Drums since before.
I just recently started to write stories directly towards the FiM actively, though I have been writing for years, publishing numerous stories at Mibba and the eventual pony story, as far as to the MLP