Lots of songs are full of great advice, but The Gambler has country's most enduring nuggets of handy hints: "You've got to know when to hold 'em / Know when to fold 'em / Know when to walk away / And know when to run." Such wisdom holds true at pretty much every point in life, and even though the words are those of songwriter Don Schlitz and that others, including Johnny Cash, released it first, it was the comforting beard and timbre of Kenny Rogers that gave such sage, fatherly advice the gravitas it needed.