I love this and think its a great idea to use dancers instead of musical instruments etc..
My only thought on this design though is that there doesnt seem to be any representation for "future"
swing/rock - disco - breakdancing all work for past, i guess break dancing could also work for present day too, and modern contemporary could work for todays music, but I don't think it works to represent the future. So I think you can eliminate one of the past elements, and add another for future
I associated dance with music for the design instead of using bands/artists and instruments.
The dances I used are: swing/rock n roll, disco, break and modern/contemporary.