“One Day As A Lion” is a musical project led by Zack de la Rocha, the lead vocalist of Rage Against the Machine. The project features a blend of rock and hip-hop elements, showcasing de la Rocha's signature vocal style and socially conscious lyrics. The band released their self-titled EP in 2008, which includes tracks that reflect themes of resistance and empowerment. The collaboration also features Jon Theodore, known for his work with The Mars Volta, on drums, adding a dynamic rhythm to the music.