Harry Potter stars Rupert Grint and Daniel Radcliffe were among the high-profile winners at the WhatsOnStage Awards on Sunday night.
The great composer's latest musical takes on the Profumo Affair of the 1960s, and seeks to clear the name of a 'scapegoat' at its centre.
The Curious Incident of the Dog in the Night-Time swept the board at the Olivier Awards, while Dame Helen Mirren was crowned Best Actress.
West End show Chicago is to close after nearly 15 years.
The musical, which went on to be made into an Oscar-winning film starring Catherine Zeta Jones, will see the curtain come down on September 1. Guest roles have gone to celebrities such as Brooke Shields, Christie Brinkley and David Hasselhoff over the years.
Barry Weissler, who has produced the show along with his wife Fran in New York and London, said: "Bringing Chicago to the West End was a pivotal moment in Fran's and my career.
"Running 15 years has been a dream come true. We may be taking our parting shots for now, but the Razzle Dazzle will never fade."
Spice Girl Victoria Beckham has tweeted about her 'amazing' day back with the band:
Thank u to all our fans for being with us today!! X vb
Thank you girls!Amazing to see u all today!!! Lots of love,Victoria x
Comedian and writer Jennifer Saunders hopes audiences will enjoy the Spice Girls musical and that they will be entertained.
Saunders says the story has a lot of "emotional content" and a "lot of laughs" and it will relaunch the Spice Girls' music.
She added the musical will have a darker side.
Geri Halliwell says she was holding back the tears when she watched the workshops of the new musical.
Mel C added that the rehearsals gave the girls "goosebumps" and it was a "lovely thing"
The girls said the musical supports Girl Power's longevity. "Who would have thought the message is still standing 16 years later".
At the press launch of 'Viva Forver', Geri Halliwell said the musical supports Girl Power's longevity. "Who would have thought the message is still standing 16 years later".
Spice Girls were in London to launch 'Viva Forever'. Emma Bunton or Baby Spice as she was known said the relationship between a mother and daughter is a big part of the show.
Victoria Beckham spoke of her excitement of seeing 'Mama' performed in the musical rehearsals, as the Spice Girls are now all mothers