Classical Movements' 'Serenade!': How do you translate 'uneven'?

For five years now, Classical Movements, an Alexandria-based travel agency specializing in performing arts groups, has mounted "Serenade!," an international choir festival spread among venues in the Washington region. This year's edition, held this past weekend, encompassed six concerts featuring 11 choirs, appearing as far afield as Frederick and Annapolis. I attended the penultimate concert, Saturday at the Church of the Epiphany in downtown Washington, which presented Coro Entrevoces (from Cu...