"Hair of Gold" (Sunny Skylar) by Gene Autry and the The Cass County Boys and The Pinafores
It's Always Sunny in Philadelphia | Sunny Day Real Estate | King Sunny Adé | Sunny | Sunny (song) | Sunny and 75 | Miss Spider's Sunny Patch Friends | Sunny Leone | Skylar Grey | Shady Deal at Sunny Acres | Hassan Sunny | Sunny Skylar | Sunny Side Up (film) | Sunny Side Up | Sunny Rogers | Sunny Murray | Sunny Delight | Sunny Chan | Sunny Beach | Sue and Sunny | On the Sunny Side of the Street | Nissan Sunny | Jim Jam and Sunny | Charlie Kelly (It's Always Sunny in Philadelphia) | Tad Skylar Agoglia | Sunny Varkey | Sunny Singh | Sunny (singer) | Sunny Ozell | Sunny Moon |
Though credited to Pat Genaro and Sunny Skylar, (With acknowledgements to the owners of the copyright in "Tis the Day") the song is just an American version of the famous Italian song 'Mattinata' written by Ruggero Leoncavallo in the beginning of 20th century.