Greg Barton performed all 128 songs from the Foos' 12 albums without taking a break in a marathon task that will take almost 10 hours.
Friday, 7 June starting at 12noon EST (5pm BST) and it was livestreamed on his YouTube channel.
The stunt raised more than $7500 (and counting) for the Cancer Research Institute and donations can be made here. Barton set a target of $5000 and surpassed that!