Keenan Cahill, the lip-syncing YouTube sensation, has a new video out – this one with noted backup singers Brian Wilson and Cody Ross.

Lou Seal also makes an appearance as Keenan and the Giants perform “Dynamite” by Taio Cruz.

Keenan, a 16-year-old from Elmhurst, Ill., has a rare genetic disorder known as Maroteaux Lamy Syndrome, which can cause individuals to develop a dwarf-like appearance. Sufferers generally experience growth retardation beginning at round 2 or 3 and progressing as they age, leaving them with “coarsening facial featuries” and “joint stiffness.”

The Giants are sponsoring a “Cody & Keenan” Social Media Fundraiser to benefit “causes dear to both Cody & Keenan.”

Elmhurst’s Keenan Cahill has become a webcam wonder (Chicago Sun Times)

Cody & Keenan Social Media Fundraiser (SFGiants)