Stephen Hough illuminates the topic of string vibrato.... Ethan Iveson writes a brief history of jazz blogging.... Lisa Bielawa recounts the latest rendition of her Chance Encounter, on the Tiber in Rome.... Matthew Guerrieri sums up the Festival of Contemporary Music at Tanglewood, which I was sad to miss.... David Fanning declares Mieczysław Weinberg's 1968 Holocaust opera The Passenger, recently given its belated stage premiere at Bregenz, a masterpiece. Stephen Walsh concurs. A New York production may ensue.... OMG OMG Cosima Wagner is on Twitter!!! (All entries are taken verbatim from her diaries, with day and month matching.) ... Huguette Clark, the reclusive 104-year-old daughter of the Gilded Age millionaire William Andrews Clark, has been found living in a drab hospital room somewhere in New York. Musical relevance? Her half-brother founded the L. A. Philharmonic.