But for those who don't know about the martyred voter registration activists, this new film is an awakening on two levels.

An enlightening journey with plenty to say about music, history and the ways music can help make history.

As we watch these once-marginalized artists thrillingly bring their past to bear on tense times, so does this look-and-listen complement the urgency of our newly charged civil rights moment.

Like two trains heading full speed in opposite directions, the two groups of men that headed down South in search of their heroes had two shockingly different fates.