From the opening minutes of Elegies: A Song Cycle, the debut presentation by the Riverbend Theatre Collective, it's clear that the production is going to be beautifully performed. An uninterrupted, 90-minute collection of reminiscences by composer William Finn, the revue finds Allison Collins-Elfline, Patrick Gimm, Jackie Madunic, Dana Joel Nicholson, and Bryan J. Tank offering musical tributes to people (and pets) that Finn loved and lost, and they form an intimidatingly strong vocal ensemble, excellent in their solos and even finer in harmony.