The energy of Antony Sher, who has died at the age of 72, was prodigious. He not only acted like a fizzing firecracker. He wrote books about his most celebrated roles, and several novels set in his native South Africa. He also wrote plays, and he painted. It was as if the stage could not contain him.

It seemed impossible and yet, the other evening, while idly flicking through emails, I learned the unimaginable: Stephen Sondheim, age 91, had passed away. And very quickly by all accounts, given that he was reported to have enjoyed a Thanksgiving meal with friends just the previous day.

Henry Woolf's place in theatre history is small but significant, a bit like Woolf was himself. Until his death on November 11, at the age of 91, he was the last survivor of a gang who made friends at Hackney Down grammar school in the 1930s. The most famous member of the group was Harold Pinter. The Room, Pinter’s first play, was more or less commissioned by him.

Few musicians get to stage-manage a dignified departure from the world.

Few singers really change your life. Norman Bailey did that for me [writes David Nice of theartsdesk]. The occasion wasn't my first experience of a Wagner opera, but it was the first time I'd been to a performance of his great human comedy Die Meistersinger von Nürnberg, during the early 1980s on one of Scottish Opera's visits from Glasgow to the vast barn of Edinburgh's Playhouse.

I only saw Christa Ludwig twice live in concert, but those appearances epitomise her incredible dramatic and vocal rage as well as her peerless artistry in everything she did. The first event was Schubert’s Winterreise with pianist Charles Spencer at the Southbank Centre, at a time when it was less common for women to take on the role of the heavy-hearted wayfarer: the intensity still resonates.

Each generation is given an actress who can do everything – be intimate with the camera but also coat a back wall in honey from 100 paces. There was Judi Dench, and then there was Imelda Staunton, both loved by all. Helen McCrory – who has died at the age of 52 – was the next in line, and she was destined to be as great for as long.

Ronald Harwood, who has died at the age of 85, was best known for his play about tending to the needs of the larger-than-life actor-manager Donald Wolfit. The Dresser, adapted by Harwood, went on to become a great film success starring Tom Courtenay and Albert Finney.

"You talk like Marlene Dietrich, you dance like Zizi Jeanmaire, your clothes are all made by Balmain, and there’s diamonds and pearls in your hair…" . Peter Sarstedt may have been a one-hit wonder, but his 1969 pop song, "Where do you go to (my lovely)?" passed into British popular culture in a flash, even if many of its chic references were lost on future generations. Zizi Jeanmaire, who died last Friday aged 96, personified the Paris of the 1940s, 1950s, 1960s, and beyond.

Ennio Morricone was a genius, or as close to that description as makes no odds. If we mean someone who created a unique body of work, one that changed culture, had a distincive style and was massively influential, then Morricone fitted the bill. theartsdesk's Joe Muggs was discussing today on Facebook and Mixmag his influence on dubstep and Jamaican music, for example.