Pink can hauntingly detail the lows that can follow a high energy music performance.

The "So What" singer appears on Janis: Little Girl Blue, about the life of tragic rock legend Janis Joplin, as part of the American Masters series on PBS, where she opens up about the deep sense of loneliness a musician can feel when the show is over.

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"You've been dancing with God for two hours, and you're feeling everything and it's all OK," the 36-year-old artist explains. "And you jump on the bus, and it's quiet. And there's nobody. And they've left a bottle of wine on the table for you."

"You've gotta calm yourself down, and you've gotta get some sleep," she continues. "And you've gotta do it all again tomorrow."

Watch the clip above.

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Revered to this day, Joplin died of an overdose at age 27 in 1970.

Janis: Little Girl Blue will premiere May 3 on PBS, a day before the DVD and Blu-ray will be available via FilmRise. The companion album, Janis: Little Girl Blue (Original Motion Picture Soundtrack), is on sale now.

Meanwhile, though Pink clearly has experience with the ups and downs of the rock star lifestyle, the singer-songwriter focused on challenges outside of music life when her 4-year-old daughter, Willow, was born in 2011.

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"Willow is all me," the GRAMMY winner told ET last November. "She's cute like her papa, and she's mean like her mama."

Watch the video below.