Umpah Umpah

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.

[1] Shortly after the group's five-year anniversary in early August 2019, it was reported that the girls would "make a speedy comeback", which was quickly confirmed by their label on the same day.

Kirsten Spruch of Billboard magazine viewed the track as "outlandish", and praised its "explosive chorus combined with glistening instrumentation and infectious melodies and ad libs".

[10] The Korea Times described the song as "a bright, energizing disco number laced electric sound rhythms, whose lyrics draw on summer images like deep waters and ice cream".

[11] Moreover, writer Justine Shaffer of SnackFever magazine described the song as "a sound that's a twist back to the summertime pop perfection vibes".

[27] The song performed better on the Billboard K-pop Hot 100, debuting at number 19, and subsequently attained the top spot on the chart for two consecutive weeks.

[4] A series of promotional photo teasers featuring the group members, along with a highlight video showcasing the song's pre-chorus was subsequently unveiled.

described it as "a fun, frenetic, pop-electro number that evokes sunny days by the beach with a bunch of your best friends", further praising the video for being "wonderfully off-beat and delightful, as always".

[31] Puah Ziwei of NME noted its "fun-filled" nature and "the vibrant, feel-good" elements" of the music video.