While in this country, a composer wrote a piece for a double orchestra in his Opus 18, inspiring another composer’s Conversation Symphony for Two Orchestras. A public concert series in this country was created by a viola da gamba player and a composer who wrote galant works including Temistocle and Zanaïda. A symphony written while its composer was in this country includes a C-minor trumpet solo and “Turkish instruments” paralleling Janissary bands. This country’s national anthem was quoted in (*) Muzio Clementi’s “Great National Symphony.” “A-Hunting We Will Go” is a folk song composed for a production of this country's The Beggar’s Opera. This country's capital names a set of 12 (10[1])Haydn (10[1])symphonies. (10[2])For 10 points, name this country where Johann Christian Bach was music master to the wife of George III. ■END■