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On Aug. 23, 1969, Cash earned a No. 1 hit with his song "A Boy Named Sue," from his 'At San Quentin' album.

On Aug. 11, 2001, Shelton scored his first No. 1 hit with his debut single,

On Aug. 7, 2004, McEntire earned her 22nd No. 1 hit with "Somebody," from her 'Room to Breathe' album.

The singer shares his favorite parts -- and the parts he struggles with -- about being a country star.

Let's test your Lambert knowledge!

Which creepy conversation topic is sure to make Underwood's ears perk up? Well ...

"This one just seemed perfect ..."

"As far as looking toward the future? I wanna be headlining arenas..."

"The first question that made me realize I was 54 years old was, 'You're gonna make a whole album?! That's so cool!'"

"I never wanna get complacent," Aldean explains of his decision to try his hand at producing.