Union Avenue Opera is nothing if not fearless, often taking on works that strain the company's space at the Union Avenue Christian Church to the limit.
The OnMusic Dictionary (at dictionary.onmusic.org) defines attacca as "a musical directive for the performer to begin the next movement (or section) of a composition immediately and without pause." Lately the symphony has been experimenting with playing compositions by different composers attacca as a way of highlighting similarities between the pieces. This weekend's bit of attacca might be the boldest yet, following the prelude to Wagner's "Tristan und Isolde" (first performed in 1859) with Arnold Schoenberg's neurasthenic 1909 "monodrama" "Erwartung" ("Expectation").
David Robertson's on-stage introduction to Philippe Manoury's "Synapse", for violine and orchestra, made more sense than the composer's own description, which fluttered about such terms as "blocks", "formulas" and "specific grammar" without really explaining their true meaning. However, Robertson's substantial personal charisma seemed insufficient to make such a piece palatable to what was easily the sparsest audience in memory at a St. Louis Symphony concert.