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Richie Unterberger, who penned the books Turn! Turn! Turn!: The ’60s Folk-Rock Revolution, Eight Miles High: Folk-Rock’s Flight from Haight-Ashbury to Woodstock, and Unknown Legends of Rock’n’Roll, among others, will be chatting Monday night about his latest effort, a 400 page, detail-filled work called The Unreleased Beatles: Music and Film, and showing rare films and playing rare recordings featured in the book. Unterberger’s book covers studio outtakes, BBC radio recordings from 1962-65, live concert performances, home demos, private tapes, and fan club Christmas recordings, and makes the case for why these recordings matter and which ones he would like to see get official releases.

I first came into contact with Unterberger when he was my editor at the now defunct indie rock, jazz, reggae and more music magazine Option. The California-based writer does extensive research for his published volumes, and writes in a straightforward, easy-to-read manner. Based on my conversations with him from way back when, along with his writing, I’d guess that tonight’s presentation will be detailed enough to please Fab Four fanatics and down-to-earth and honest enough for those who may only be familiar with the Liverpool lads greatest hits.

From 7 p.m. to 9 p.m. at the Library of Congress Mary Pickford Theater, Madison Building, 101 Independence Ave. SE. 202-707-5677. The event is free.