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As always, the blissful artistry of “Severance” is in the details – the completed circle of Mark opening the season with a mad dash through the halls and ending it hand in hand with Helly, jogging to who knows where as Mel �մǰ���é croons a wending carpet of easy listening psychedelia behind them.

At 66, the trumpeter, composer, arranger and bandleader has collaborated with everyone from Mel �մǰ���é to LL Cool J. A founding member of the Klezmatics, a band that helped to revitalize the klezmer style during the late ’80s, London has worked for decades at a fertile crossroads where Jewish music meets downtown jazz.

It’s been performed by acts as varied as Mel �մǰ���é, Weezer, Miley Cyrus and the punk band Simple Plan.

There were the parties, where the likes of Rosemary Clooney, Ella Fitzgerald and Mel �մǰ���é would gather around the piano and sing.

There was Sinatra, obviously, and Dean Martin and Doris Day, who were as big on screen as they were on record — but also Dinah Shore and the Andrews Sisters, Mel �մǰ���é and Merv Griffin, Frankie Laine and Perry Como.