The songs "Free Bird" and "Sweet Home Alabama" are listed as available as DLC, and so you can't download them
However, in the steam store they are no longer available:
And I don' think they've been available for some time. You can see I bought all of the songs except for Simple Man by Lynyrd Skynyrd a few years ago, and "Free Bird" and "Sweet Home Alabama" were not available.
Can you please make these available, since they're no longer available as DLC?