3E18

3E18 is the 18th episode of the third season of the American television series Supernatural, and the 44th episode overall. The episode is titled "Classic Rock" and originally aired on May 1, 2008. Written by Jenny Klein and directed by J. Miller Tobin, the story takes a break from the regular Supernatural formula, instead focusing on music from the 1970s.

The episode follows Sam and Dean Winchester as they hunt a trio of rock musicians from the band Bloodstone who make a deal with the Crossroads Demon to become a rock sensation but eventually sell their souls in exchange for fame. The hunter brothers soon discover that the musicians are killing people who do not like their music, and it rapidly becomes apparent that their contracts with the Crossroads Demon are coming due.

3E18 features a unique format, often referred to by fans as a "genre-defying" episode, with an original storyline based on the band's history. The episode's writers drew inspiration from 1970s music trends and works such as Rodney Crowell's songs "What Would We Be Without You" and "And I Love Her" as well as references to the rock band Aerosmith.

Reviewers praised the originality of the storyline, the music, and the genre-transcending approach to the character development. Critics praised the performances of guest stars Jared Padalecki, Jensen Ackles, and 70s rock music itself.

The episode concludes with Sam and Dean successfully killing the three rock musicians and saving their souls before the contracts with the Crossroads Demon were about to expire.