In Baroque, Classical and Romantic Music (basically most western style) concertos from Bach to Rachmaninoff style in a minor key always end up finishing in the Major key (eg. Rach 3 begins d minor - ends in D Major, Mendlessohn Violin in e minor - starts in e minor - ends in E major.)...
Is this rule completely true, or are there exceptions. And before people start saying - no prokofiev and schoenberg break these rules - I'm not asking about that type of music - I'm talking about the conventional musical writing, the tonal composers.