9 to 5

"9 to 5" is a song written and originally performed by Dolly Parton for the 1980 comedy film of the same name. The chorus was played over the end credits of "Summerween," and is to date, the only real media brand used directly in the show.

Lyrics
Workin' nine to five  What a way to make a livin'  Barely gettin' by  It's all takin' and no givin'  They just use your mind  And they never give you credit  It's enough to drive you  Crazy if you let it 

Nine to five, for service and devotion...