Before coming to Boston in 1998, Sommerville was formerly principal horn of the Canadian Opera Company and Symphony Nova Scotia, acting principal horn of the Chamber Orchestra of Europe (1996–1998), associate principal horn of the Montreal Symphony (Orchestre Symphonique de Montréal) (1986–1991) and third horn of the Toronto Symphony Orchestra (1997).
Europe | London Symphony Orchestra | Philadelphia Orchestra | orchestra | Eastern Europe | Chamber of Deputies | Central Europe | Chicago Symphony Orchestra | Royal Philharmonic Orchestra | Cleveland Orchestra | Council of Europe | chamber music | London Philharmonic Orchestra | Boston Symphony Orchestra | BBC Symphony Orchestra | Organization for Security and Co-operation in Europe | National Symphony Orchestra | Electric Light Orchestra | Western Europe | Chamber of Commerce | National Symphony Orchestra (United States) | Melbourne Symphony Orchestra | Boston Pops Orchestra | United Nations Economic Commission for Europe | Sydney Symphony Orchestra | Europe 1 | Royal Concertgebouw Orchestra | Minnesota Orchestra | Jerusalem Symphony Orchestra | Dallas Symphony Orchestra |
He then worked with a wide variety of orchestras and ensembles including the Chamber Orchestra of Europe, London Symphony Orchestra, Royal Philharmonic Orchestra and BBC Symphony Orchestra.
He has performed under the baton of James Conlon, Peter Oundjian, Hans Vonk, David Zinman, Robert Stern and chamber music performances with members of the Berlin Philharmonic, Chamber Orchestra of Europe and many others.