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 (15[1])galant (15[1])works including (15[1])Cefalo (”cheh-FAH-loh”) e Procri. 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 (10[1])names a set of 12 Haydn symphonies. For 10 points, name this country where Johann Christian Bach was music master to the wife of George III. ■END■