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My solution for challenge 189 hereafter where I used 2 separate ways for top 100 and top 10!
For top 100 I used a multirow formula: if [Count]=[Row+1:Count] then [Artist]+', '+[Row+1:Artist]
else [Artist]
endif
For top 10 I used 2 summarize tools: The first to group by decade and artist and to count the amount of times an artist appeared each decade and the second to get the max count per decade.
I then join these tools on decade and count and used a last summarize to concat the artist names.