Marvin Gaye and Tammi Terrell sang "ain't no mountain high enough, ain't no valley low enough, ain't no river wide enough, to keep me from getting to you."
Unfortunately the music industry is not as resilient nor everlasting as love, and the disruptive forces buffeting it have pushed sales back to levels not seen in more than 20 years. As you view the chart below, keep in mind that Musicland declared bankruptcy in 2006 and Tower Records shuttered their last 89 stores the same year; Virgin closed their U.S. Megastores in 2009.
"Remember the day, I set you free I told you, you could always count on me, darling. From that day on, I made a vow, I'll be there when you want me, someway somehow." Ain't no mountain high enough, indeed.