A good chorus needs to be versed in French, German and Italian diction. Occasionally Spanish, Russian and Czech come into play. But Elvish and Dwarvish? This weekend, local singers will have to master those languages and more as the Pittsburgh Symphony performs “The Lord of the Rings Symphony” under the direction of composer Howard Shore. It’s a six-movement work for orchestra, soloists and choruses comprising music he wrote for Peter Jackson’s acclaimed film version of J.R.R. Tolkien’s ‘Rings’ trilogy. [More]