Chances are you aren’t particularly familiar with the musical instrument called a “piano accordion.” After all, it’s not as though Rolling Stone or Gramophone is publishing its list of “100 Greatest Piano Accordionists” and everyone will argue about who should have been slotted where or who got left off.

Pay attention, though, because we’re not talking about a regular button accordion you’d hear in a zydeco band.

The piano accordion, a larger construct, creates evocative, beautiful sounds — and, at the mercy of Rachel Bell and Karen Axelrod, who perform as the chamber-folk duo Peregrine Road, the possibilities are refreshingly and distinctively delivered. Axelrod is also a splendid pianist, and together they spin dazzling original music and selections of Celtic, French and English country dance pieces.

Peregrine Road returns Saturday to the La Grua Center in Stonington for their second appearance in the facility’s renowned Music Matters series. See the concert and then race out and by a piano accordion.

Peregrine Road, 5 p.m. Saturday, La Grua Center, 32 Water St., Stonington; Music Matters series; $20 advance, $25 door; lagruacenter.org, (860) 535-2300.