The first song that came to mind was simple ... who doesn't remember The O'Jays talking about cash money in their 1974 hit song, For The Love of Money!
However, my current economic situation seems to flow more with Simply Red and his lyrics from his first big hit, Money's Too Tight To Mention:
I been laid off, my rent is due
My kids all need brand new shoes
So I went to the bank to see what they could do
They said 'son looks like bad luck got a hold on you'