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Despite energetic and precise leadership from on the podium, persistent sound issues plagued this program of contemporary American music.

Yo-Yo Ma's beauty of tone was as remarkable as always in Tchaikovsky's Rococo Variations.

Prom 70, the last concert for the BBC Symphony Orchestra prior to the Last Night festivities, featured three talented Americans: composer Missy Mazzoli, pianist Jeremy Denk and conductor Karina Canellakis.