It’s always cool to see musicians willing to stand with workers on strike. Last month, Billy Bragg joined Starbucks workers in a picket line demonstration in Buffalo. Today, the forever-changing Scottish band Primal Scream and the Birmingham legends Dexys Midnight Runners — a one-hit wonder in the US but an institution in the UK — have come together on “Enough Is Enough!,” a new song released to raise money for striking rail workers in the UK.