People like to complain about who gets to be a country music star these days. But the real problem lies in who doesn’t, and with one of the most perfectly melancholy voices you can imagine, Melonie Cannon is the ultimate case in point. As beautiful as the Brad Paisley/Alison Krauss version of Bill Anderson and Jon Randall Stewart’s “Whiskey Lullaby” is, Cannon’s is even more heart-wrenching. The song appeared on her 2004 debut, and she followed up with an equally graceful set in 2008. That makes her long overdue for another release, and she doesn’t make all that many appearances, either — so this is an opportunity not to be missed. Accompanying her tonight is an all-star crew that includes regular banjo player (and master luthier) Sim Daley and his frequent musical buddy, bassist Tim Dishman; friends and frequent collaborators Deanie Richardson (fiddle) and Jeff White (guitar); and young mandolinist-about-town Chris Harris.