Um Jammer Lammy is a rhythm-based music game developed by NanaOn-Sha for the Sony PlayStation 1. Released in 1999, it's a spin-off of the popular game PaRappa the Rapper. Players take on the role of Lammy, a guitar-playing lamb who must make it to her band's concert on time. The game requires players to match button presses in time with the music, as the screen displays combinations that mimic playing different musical riffs. With its distinctive animation style, quirky characters, and a wide variety of musical genres, Um Jammer Lammy offers a unique and engaging experience for fans of music and rhythm games.