HomeMusicStudio SessionsSlappy EP Session Dates(s) April 20, 1990 Studio(s) Art of Ears Studios (San Francisco, CA) Artist Billie Joe – Vocals, GuitarMike Dirnt – Bass, VocalsJohn Kiffmeyer – DrumsAaron Cometbus – Backing vocals (‘Knowledge’) Crew Producer: Green Day & Andy ErnstEngineer: Andy ErnstMastering: John Golden Set Key: [O] Officially released | [U] Unofficially released | [X] Unreleased [O] Paper Lanterns[O] Why Do You Want Him?[O] 409 In Your Coffeemaker[O] Knowledge Notes Liner notes: Recorded in a few hours on April 20th, 1990 at Art of Ears Studio with Andro engineering. Mixed April 23rd in a few more hours.All songs from this session would be included on the Slappy EP and later re-released on the 1,039 Smoothed Out Slappy Hours compilation. Sources & Credits Todd – set