Lots of recommendations for this one, which may have been the problem ("expectations"), but I was not thrilled with this. Stars the same kid who played a teenage alcoholic (which I appreciated) in something else I recently watched (forgot the title) ... "a less Jewish Zuckerberg."
Anyway, it's about a music student and his sadistic drill instructor, er teacher ... it was around 100 minutes which was its saving grace ... I didn't fast forward so it gets a yellow rating, but I definitely would not recommend it. From 2014 I can still recommend only The Lunchbox and Nightcrawler, nothing else.