Operation Ivy
Other bands to cover Operation Ivy songs include a rendition of "Healthy Body" by Area-7, "Smiling" by Goldfinger, "Sound System" by Buck O Nine, "Caution" by No Trigger and more covers of "Knowledge" by both Millencolin and Evergreen Terrace. Link 80 was known to cover "I Got No," "The Crowd" and "Room Without a Window" (which appeared on their first demo, recorded at Gilman). Hollywood Undead released a cover of the song "Bad Town" in 2010, Green Day recorded a cover of the Operation Ivy song "Knowledge" for its extended play "Slappy" which was later released on the compilation album "1,039/Smoothed Out Slappy Hours". Green Day have continued to play the song live (where the band picks members out of the audience to play its instruments). Additionally, Rancid have played Operation Ivy songs at its live performances. In October 2015, Leftöver Crack, a band heavily influenced by Operation Ivy, were joined by Jesse Michaels for performances of "Sound System" and "Unity". Armstrong also joined Boston ska band Big D and the Kids table for a performance of "Sound System" in Montreal.