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25 January 2012, 16:49 | Updated: 25 January 2012, 16:59
The 'Cry Me A River' star has been impressing during preparations for the new Coen Brothers movie.
Justin Timberlake's co-star on the new Coen Brothers film 'Inside Llewyn Davis' Oscar Issacc has described the 'Sexy Back' singer's voice as "perfect" as the pair take part in final musical preparations for the film.
As the movie is based around the life of a travelling folk singer, MTV News asked Oscar how well Justin can sing in a different genre.
"He's perfect, really pure," he said.
The film also stars Carey Mulligan who is engaged to Mumford And Sons star Marcus Mumford – who is also helping in the studio with the cast.
Oscar admitted he was excited to be working with an "amazing group of musicians."
Meanwhile, Justin is reportedly being lined up to play Elton John in a big movie blockbuster on the 'Rocket Man' singer's life.