What Is This Thing? is a song from the Season 3 finale episode Blackout!, sung by Fee Waybill, when Candace was riding Phineas and Ferbs unseen .\r<br>\r<br>Link to part 2!- Enjoy, and leave comments about what you think! These are my personal top 45 Phineas and Ferb .\r<br>\r<br>Follow me on Twitter: Add / like me on Google+: Full version of the .\r<br>\r<br>Every Phineas and Ferb song, in order by episode! If any videos are missing/have been deleted, let me know and Ill find a replacement. Enjoy!!
