The name represents a renowned rock brand. The logo is equally legendary. And the tunes remain timeless — in some instances, even after a half-century (or more). Arguably the biggest act on the planet, Chicago was flying a mile high — racking up an impressive string of five consecutive #1 albums and a slew of countdown-crashing singles. I was just 13 when the band’s eighth studio set, Chicago X, arrived in stores via Columbia Records, 45 years ago this week. Resembling a partially unwrapped chocolate bar, the eye-catching album cover image could have made for a legit inclusion in my vast collection of Wacky Packages trading cards. It was the sizzlin’ summer of ’76, and X wasn’t the first Chicago record my (then) 16-year-old sister had brought home. Being a bonafide R&B freak, I noticed...