Willie Nelson and Leon Russell were prominent figures in country music, known for their distinctive styles and significant contributions to the genre. Nelson, characterized by his relaxed, behind-the-beat singing style and gut-string guitar, was a leading figure of outlaw country music. Russell, on the other hand, blended rock, country, and gospel to create a unique sound. Their collaboration album, "One for the Road", is deemed an influential work, showcasing their dynamic synergy and mastery of country and blues.