Why: Reba McEntire has had No. 1 songs in four different decades, something very few other artists can claim. Fans new to country music know her more for her acting career these days, but it's hard to find a female vocalist who has stayed relevant for as long as the 'Fancy' hitmaker and 1986 CMA Entertainer of the Year. With over 30 No. 1 songs, Reba's resume dwarfs almost any artist's, although the competition for 'M' is very stiff. Fans of Tim McGraw and Bill Monroe could make convincing arguments.

Honorable Mentions: Bill Monroe, Tim McGraw, Martina McBride and Barbara Mandrell.

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