Untitled Griffin Family History - S4-E27
Continuity mistake: In the scene where Al Cowlings and his "trusty white bronco" help the Griffins escape, his white horse changes color to light brown during the passing view then changes back to white in the following overhead view.
Chosen answer: It's a real song called "Elvira". Originally by Dallas Fraizer in '66, however, this version seems to be the Oak Ridge Boys cover version. However, the mega lesbians skip the verse and just sing the chorus after the opening line.
Bishop73