Over the past two decades, the Academy Awards have been in a constant state of flux: There are now 10 best picture nominees instead of five, the membership has grown (and diversified) by more than 50% in that time,

The Oscar-nominated short films in animation, live-action and documentary categories got off to a strong first weekend in theaters in their 20th year of release

Two themes emerge among the doc short nominees, as voters decide between hard-hitting issue docs and lighter portraits on the unifying power of music.

"The film is sort of meeting its moment." The brothers and co-directors behind Oscar-nominated short film, "A Lien," hope the themes about immigration strike a chord with moviegoers.