Adam and David Moss began hearing Everly Brothers comparisons long before they officially joined their voices together as folk duo The Brother Brothers. But not even the late Phil and Don Everly, one of the greatest DNA-sharing duos in modern music history, could claim the kind of vocal symmetry Adam and David create. Harmonies just don’t get any closer than those sung by siblings who came from the same egg.

The twins, raised in Peoria, Illinois, weren’t much older than toddlers when they started singing along to the Everlys, The Beach Boys, and other artists their dad played for them. Lulled to sleep nightly by The Beatles’ White Album, they made up their own harmonies to accompany Paul McCartney’s vocal on “I Will” when they were 6.

That song was one of the first they chose for their third Compass Records release, Cover to Cover, on which they pay homage to formative influences and favorite songwriters with a mix of beloved classics and songs they want more people to hear — each filtered through the brothers’ unique musical mix of folk, bluegrass, jazz and other idioms.

Among their eclectic picks: Tom T. Hall’s “That’s How I Got to Memphis,” Jackson Browne’s “These Days,” James Taylor’s “You Can Close Your Eyes,” Hoagy Carmichael’s “I Get Along Without You Very Well (Except Sometimes),” Robert Earl Keen’s “Feelin’ Good Again,” Richard Thompson’s “Waltzing’s for Dreamers,” Judee Sill’s “Rugged Road” and Tom Waits’ “Flowers Grave.” They also chose Harley Allen’s “High Sierra,” popularized by Dolly Parton, Emmylou Harris and Linda Ronstadt on their Trio II album, and “If You Ain’t Got Love,” by Chas Justus of Lafayette, Louisiana dance band the Revelers.