While new country acts often establish themselves with elements of rock ’n’ roll sound and visual style designed to win the approval of younger listeners, brother-and-sister duo Lee and Elaine Roy opt for a refreshingly unadorned bluegrass approach that says “bring the family.”

On that subject, they’ve brought along Ricky Skaggs and his kin, The Whites, who add vocals on a song of selfless sacrifice, “That’s What Makes It Love.” The similarly inspirational “Give the Devil a Ride” is elevated by folksy wisdom, while the vibrant “Trailblazer” fosters a never-say-die spirit.

Though they make for a pleasant listen, many tracks here stick too close to time-tested territory to distinguish themselves beyond standard-issue acoustic music fare. The Roys’ unassuming vocal performances can sound lightweight next to the forceful instrumental work by members of Ricky Skaggs’ band, who bring a welcome bluegrass bite to the proceedings.

But if Lonesome Whistle lacks the keening whine its title implies, it sounds a sweet note for listeners who respond best to a gentler frequency.