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What sort of genre is it?
"Nightshift" by the Commodores.
That wasn't it. It sounded country.
Trying To Love Two Women By The Oak Ridge Boys, has a similar line in it that goes "At best it's only half good; a man can't stock two shelves It's a long old grind, and it tires your mind.", could that be the song you're looking for?
Edited by pikafanThat isn't it either.
"On the night shift now. It will always get you double. It will wear you down."
Help is appreciated.