Conductor Juanjo Mena talks with WCRB's Brian McCreath about a Boston Symphony Orchestra program that includes Mieczyslaw Weinberg's Violin Concerto, as well as Prokofiev's Symphony No. 1 and Tchaikovsky's Symphony No. 4, and Richard Egarr describes his Handel and Haydn Society program of Mendelssohn's Symphony No. 4 and Beethoven's Symphony No. 3.