By Piya Sinha-Roy LOS ANGELES (Reuters) - Since the early days of film, music has gone hand in hand with movies, but a new crop of filmmakers is using music to explore existential themes of humanity that will be showcased at the annual Sundance Film Festival. The film, directed by Damien Chazelle, stars rising star Miles Teller as a drummer who enters music school and comes face to face with a teacher who challenges him to pursue perfection, pushing him to the limit.

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