Wolfgang Amadeus Mozart shares his birthday with the International Holocaust Remembrance Day. There’s a moving kind of harmony in that . . . . Albert Einstein once said that Mozart’s music was “so pure that it seemed to have been ever-present in the universe, waiting to be discovered by the master.” Later in life, the scientist confessed that “Mozart remains as beautiful and tender as he always was and always will be.” Here’s to Mozart in 2016 — and always — with his very last concerto, his only one written for the clarinet. Its middle movement is of the ever-present stuff Einstein mentions: both inimitable and inevitable.