Conversation so far:
when was the first now that's what i call music
1983
what is the latest now that's what i call music
The most recent album in the series, Now That's What I Call Music! 71, was released on 2 August 2019. The Now!
who is the creator of now that's what i call music
The idea for the series was conceived by the head of Licensing and Business Affairs at Virgin Records – Stephen Navin, and General Manager – Jon Webster.
who are the most featured artists on now that's what i call music
As of 2018, the most featured artist was Robbie Williams with 30 singles, followed by Rihanna and Calvin Harris with 27.

Question: what was the most successful volume
Self-contained rewrite: what was the most successful volume for now that's what i call music