"Gradation Vol.4" is the ninth digital single by ELO. It was released on May 29, 2018, and is the last part of his four-part "Gradation" single project. Track list "Osaka" (feat. Zico) - 3:25 Video links "Osaka" music video Teaser 1 / 2 "Osaka" DF Live video This article is a stub. You can help Kpop Wiki by expanding it. Retrieved from "https://kpop.fandom.com/wiki/Gradation_Vol.4?oldid=121228" Categories: Single article stubs ELO Zico 2018 releases 2018 digital singles Singles Digital singles Community content is available under CC-BY-SA unless otherwise noted.