Don't be surprised if, settling into "The Last Five Years" with your popcorn, you hear a large number of people around you singing rather than crunching.

That's because the stage play it's based on, a soulful and romantic song cycle by composer Jason Robert Brown, is a cult favourite of musical theatre aficionados, not to mention a preferred source of audition songs. Most recently revived off-Broadway in 2013, it's the charming and ultimately mournful story of a five-year relationship, from its giddy, heady beginnings to its depressing end.

Only here's the twist: The woman's journey starts at its sombre conclusion — a Dear Jane letter — and moves backward in time to its sunny early days. The man travels forward in time, and the two meet, chronologically speaking, only in the middle, for a marriage proposal amid the majesty of Manhattan's Central Park.

Alas, that clever structure doesn't work nearly as well in this screen version, adapted and directed by Richard LaGravanese and starring Anna Kendrick and Jeremy Jordan as lovers on opposing trajectories. That's because it's just too darned confusing. In the stage version, the lovers — aspiring actress Cathy and ambitious novelist Jamie — sing their alternating songs alone onstage, and it's fairly clear where we were in each journey.

Here, the other character is present — though mainly silent — during their partner's solos. But wait: Is this "early" Jamie or "late" Jamie? After a while the head spins, simply trying to keep track. It's distracting.

Of course, the main attraction is the score — there's hardly any dialogue — and Brown's melodies are truly infectious, though perhaps lacking the depth of his gorgeously lush, Tony-winning score for "The Bridges of Madison County." A few of the lyrics here have been updated from the 2002 original (now-defunct Borders has become Target) but mostly, they remain intact, and they're frequently laugh-out-loud clever.

And the film does have one asset the stage production didn't: a bona fide movie star in the fast-rising Kendrick, who cut her teeth in musical theatre and is, not surprisingly, charming and quirky and altogether irresistible as Cathy. As for Jordan, the Tony-nominated star of "Newsies: The Musical" and TV's "Smash," he's drop-dead handsome and has a great singing voice; If he doesn't match his co-star in the charisma department, it's not really a fair fight.

Jordan's character is also far less sympathetic. A young literary prodigy, Jamie has dropped out of Columbia and is having his debut novel published. Such a thing can go to a guy's head, and it does. He loves Cathy — "Shiksa Goddess" is an amusing ode to her goy loveliness — but he seems to love himself an awful lot, too.

Cathy, meanwhile, spends her days waiting hours in line to audition alongside younger and thinner women "who've already been to the gym." Kendrick is especially entertaining singing "A Summer in Ohio," a wry look at the indignities of doing summer stock in Ohio, "sharing a room with a former stripper and her snake, Wayne." Or in "Climbing Uphill," where she hilariously shares her inner thoughts during an audition ("Why is the pianist playing so loud? Why is the director staring at his crotch?")

Marriage comes at the midpoint: "Will you share your life with me for the next 10 minutes?" Jamie asks in a glorious duet. When things fall apart, we should perhaps feel sadder, but remember, at the end, things are falling apart for only one of the lovers. Cathy is flying high, because she's just met Jamie, and so her lovely "Goodbye Until Tomorrow" is really just a happy reflection on a great beginning. "I will be waiting," she sings confidently. We will, too — to hear Kendrick sing again. In anything.

"The Last Five Years," a Weinstein Co. release, is rated PG-13 by the Motion Picture Association of America "for sexual material, brief strong language and a drug image." Running time: 94 minutes. Two and a half stars out of four.

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MPAA definition of PG-13: Parents strongly cautioned. Some material may be inappropriate for children under 13.

News from © The Associated Press, 2015