On Monday night, the Library of Congress series of free concerts hosted the Czech Philharmonic Chamber Orchestra, on their latest North American tour. The score of musicians from Prague, playing without a conductor, got a rough start on the opening work, Antonio Rosetti’s Sinfonia in G Minor. Still, it was a welcome discovery from the ensemble’s homeland (it turns out that Rosetti was born in Bohemia as Franz Anton Rössler), with fast and sinuous outer movements that were often reminiscent of Mozart’s 25th symphony. The third movement has a charmingly rustic Fresco B section, featuring the fine playing of the group’s principal oboist, Jana Brožková (shown at right). She also appeared as soloist in Alessandro Marcello’s D minor oboe concerto on the second half, with grace, accuracy, and bubbling embellishments.

The rest of the program consisted of much more mainstream Classical repertoire, none the less welcome for it. Young violinist Barbora Kolářová, not coincidentally a student of the CPCO’s concertmaster and director, Pavel Prantl, had an amiable outing in Mozart’s third violin concerto. She played well, but her tone was nondescript, making the performance come off as a little polite, capable certainly but hardly memorable. The CPCO’s playing was the best in the final selection, Haydn’s 8th symphony (G major, “Le Soir”), especially in the brisk and perky first movement with noteworthy solos by flutist Jiři Valek, as well as the windswept encore, the fourth movement of Mozart’s 29th symphony. All of this promise was overwhelmed by decidedly unpolished playing from the ensemble overall, from far too common intonation issues and missed notes, splats in the horns, and sometimes dolorous E string playing from concertmaster Pavel Prantl in the Haydn. This was not a concert that quite lived up to the group’s reputation.