Obito is pretending to be Madara.
This is my remix/parody of Paffendorf Dance.
Sources:
Orginal Song: Paffendorf Dance / Paffendorf - Under My Skin
Vocal: Madara Uchiha (うちはマダラ) (Obito when he imitated Madara's voice)
Anime: Naruto Shippuuden
You can also watch this video on YouTube:
▶️ DTube
▶️ IPFS