"Umpah Umpah" (Korean: 음파음파; RR: Eumpa eumpa; lit. Sonic Wave) is a song recorded by South Korean girl group Red Velvet for their seventh (ninth overall) Korean extended play (EP) The ReVe Festival: Day 2, which serves as the second installment of the group's The ReVe Festival album trilogy. The song, alongside its vacation-themed music video, was released on August 20, 2019, as the lead single from Day 2. Written by Jeon Gan-di and composed by Christoffer Lauridsen, Andreas Öberg and Allison Kaplan, "Umpah Umpah" is described as "an uptempo dance song with disco house rhythms", with the group's "lovely and cool vocals doubling the freshness". The songwriting, which includes swimming motifs, portrays somebody falling in love with the eyes and charms of the girls, using the phrase "umpah um