So to recap.
The writer doesn't know his baggies from his flares.
The soundtrack will feature tracks from 'The Dap Kings, Sharon Jones, Amy Winehouse*, Mark Ronson*, Paul Weller and Duffy (*in discussions)'.
All well known artists in 1974.
The Casino sequences will include records not played at the Casino.
And we still don't know if the songs will be the original artists.
This is going to be a blockbuster.
If you want to make a 'period' movie at least try and make it accurate.