Robert Trujillo is an American musician best known as the bassist for the heavy metal band Metallica. He joined the band in 2003, bringing his unique style and energy to their music. Trujillo has also played with other notable bands, including Suicidal Tendencies and Ozzy Osbourne. Born on October 23, 1964, in Santa Monica, California, Trujillo developed a passion for music at a young age. He is recognized for his impressive slap bass technique and has contributed to several of Metallica's albums, helping to shape their sound in the 21st century.