Imagine staying awake for 78 hours straight.
Now, picture yourself playing music continuously over the course of those three-plus days, and actually, playing just one song, and stopping only for bathroom breaks.
It's an incredibly grueling -- though familiar -- undertaking for Minneapolis singer-songwriter Mark Mallman.
Mallman embarked on the third music marathon of his career, "Marathon III" he calls it, at St. Paul's Turf Club at 4 p.m.
As he was setting up on stage, Mallman told Chris Roberts the marathon isn't about any super-human feat, it's about creating art.
Mallman is streaming the performance on his website, where you can watch it live, 24-7, at markmallman.com.