What’s your favorite collaboration between artists?

So there's this album credited to Andrew Peterson... and yeah, he wrote the songs for it, and is the core that holds it together, and has lead the tour of it for 20+ years. But in its original form it is such an amazing collaboration between half a dozen folks who are solo artists in their own right: Jill Phillips, Andy Gullahorn, Andrew Osenga, Derek Webb, Peterson, Ben Shive... and then a full complement of amazing supporting players. Wowza.

I first heard this song when Jill sang it while sitting on a living room couch, accompanied by the two Andys on guitars... but that's a different story.