Finnish conductor John Storgårds makes his BSO subscription series debut in four concerts with the Boston Symphony Orchestra and pianist Martin Helmchen. Helmchen will perform Mozart’s Piano Concerto No. 22 in E-flat at the Symphony Hall in Boston on the 24, 25, 26 and 29 January. Storgårds will also be conducting three works by his fellow countrymen Saariaho (Ciel d’hiver) and Sibelius (Symphonies No. 6 and 7).