Tim McGraw stands as a country music giant, his career stretching across decades. He's got a knack for creating chart-toppers that stick with fans from all walks of life. McGraw has sold over 80 million records worldwide -- yep, that makes him one of the best-selling artists ever. His albums have given us 65 singles, and 25 of those shot straight to number one on the Hot Country Songs or Country Airplay charts. Let's look at McGraw's longest-running No. 1 hits and how they lined up with key moments in country music's evolution.