Birmingham is the city that discovered Sir Simon Rattle, and 40 years on from his debut as principal conductor of the CBSO, it’s always a red letter day when he returns to the hall that he had built, in the city that’s still his true musical home. Today – thrillingly – he pairs Beethoven’s most explosive symphony with the lush, emotionally-supercharged music of Alban Berg. It’ll never sound better than it does here in Symphony Hall.