Yes, Joaquin Phoenix performed all of his own vocals in "Walk the Line." He portrayed Johnny Cash in the film and worked extensively to capture Cash's distinctive sound. Phoenix, along with Reese Witherspoon, who played June Carter, recorded the music for the film, ensuring that their performances were authentic. Their dedication to singing their parts added to the film's realistic portrayal of Johnny Cash's life and music.

"Walk the Line" is a biographical film about Johnny Cash and June Carter, portraying key events in Cash's life and career. While it captures the essence of their relationship and Cash's struggles with addiction, some details are dramatized or simplified for cinematic effect. Certain events, like the timeline of Cash's rise to fame and his relationship with family members, may be altered. Overall, the film provides a compelling representation of Cash's life but should not be taken as a fully accurate historical account.

"Walk the Line," the biographical film about Johnny Cash, won 1 Oscar out of 5 nominations at the 78th Academy Awards in 2006. The film received accolades primarily for Reese Witherspoon, who won the Oscar for Best Actress for her portrayal of June Carter Cash. The other nominations included Best Actor for Joaquin Phoenix, Best Sound Mixing, Best Film Editing, and Best Costume Design.

No, Elvis Presley does not appear in the movie "Walk the Line." The film focuses on the life of Johnny Cash, portraying his rise to fame, struggles with addiction, and his relationship with June Carter. While Elvis is a prominent figure in the music industry during the same era, he is not a character in this biographical drama. The movie features other real-life artists and events but centers primarily on Cash's story.