Summer solstice events: the Garden of Memory in SF, Roots and Rhizomes in Banff (with the premiere of JLA's Inuksuit), Make Music NY (with the long-awaited reprise of Henry Brant's Orbits).... To tweet or not to tweet? Amanda Ameer ponders the new fad for Twittering during concerts, checking in with David Lang and Hilary Hahn. Greg Sandow is pro; Matthew Guerrieri is con; Lisa Hirsch takes a historical perspective. Although I enjoy reading mid-concert reports from Steve Smith and others, I have to join the old-fogey camp on this one. When Parissa sang last Friday night, the guy in front of me started tweeting on his iPhone, puncturing the mystical state into which I'd drifted. His chatter had nothing to do with the Iranian election, which was on everyone's mind that night.... The average age at French classical concerts is thirty-two? So says Norman Lebrecht, who also notes a surge in classical record sales across the channel.... Larry Lash reviews a wild Threepenny Opera in Vienna.... Justin Brierley is presenting up-to-the-minute playlists on WRIU in Rhode Island.... VOX, New York City Opera's annual new-opera workshop, offers up music and videos from its 2009 edition.... The gifted young conductor Joana Carneiro has been appointed the music director of the Berkeley Symphony, replacing Kent Nagano. On a June 28 KALW broadcast / webcast you can hear her conduct John Adams, Magnus Lindberg, and Beethoven.... Community MusicWorks hopes to play for Obama.... Best wishes to the humbly brilliant New Zealand singer-songwriter Chris Knox, who, as his family reports, is recovering from a stroke. Knox's "Not Given Lightly" is — with some debt to "The Boy I'm Gonna Marry" — one of the great love songs of the late twentieth century.... A few days late, fulsome happy-birthday wishes to the great Alan Rich, who turned eighty-five on June 17.