Red Velvet's 2nd album of 'The ReVe Festival', [Red Velvet 'The ReVe Festival' Day 2] features total 6 songs. The title track "Umpah Umpah" is an onomatopoeia of breathing technique in swimming. It is an up-tempo dance song based on disco house rhythm, in which funky guitar riffs and pluck bass blend perfectly with the disco rhythms' synth sound. It refers "the unforgettable moment" to swimming, as the body remembers and never forgets when one first learns to swim. The song talks about teaching how to breathe while swimming, creating a pleasant memory with a lover with your eyes and charm.The album is filled with songs that will satisfy sentiments of summer to the fullest, with colorful and rich vocals of Red Velvet.The album includes 1 booklet (48p), 2 initials-only folded posters (1 group poster+1 member poster: random 1 out of 5), 1 travel kit (random 1 out of 5), and 1 photo card (random 1 out of 10).This is an official release from SM Entertainment and will count towards Billboard and Gaon charts.