Update (3/31, 1:15 p.m.): Michael Dorf, the CEO of City Winery, where Wednesday night's rehearsal took place, emailed the following:

"There was a miscommunication about the use of the Holy Holy’s drum kit last night on the tight City Winery stage for the rehearsal show. Very unfortunate. I would hope that after a nights sleep and knowing we have a much larger stage with multiple drum kits and other equipment that The Roots will still join us this evening. They have been a regular part of our tribute series and we deeply love and respect them. I remain hopeful they will still join the important celebration of David Bowie’s music tonight and tomorrow and the two sold out shows can experience their powerful performance as one of the 20 amazing songs planned."

Original story (3/31, 9:30 a.m.): Tonight marks the first of two Music of David Bowie tribute concerts in New York City, and The Roots aren't taking part anymore. They were one of a small handful of acts slated to perform at both Carnegie Hall on Thursday and Radio City Music Hall on Friday; Mumford & SonsR.E.M.'s Michael Stipe, The Mountain Goats, Esperanza Spalding, The Flaming LipsCat Power, the New York City Children's Chorus and tons more are also featured.

Neither Bilal nor Kimbra are performing anymore, either.

So what went wrong? Apparently some of the other artists, or the production crew perhaps, weren't sharing nicely. Questlove Instagrammed a pic of an unimpressed Diddy with the caption:

"Mood. I've never been so insecure or petty as to deny a fellow musician use of ANY of my equipment (or my band's equipment----or resources or contacts or knowledge or ANYTHING) it angers me when that same courtesy is not reciprocated. (Believe you me I was about to get #TomPettyor #PettyWap or #PetRockAndCLSmooth or #BlackPetty or however you wanna roll wit it)---keeping a level head and not being self destructive is a weak point I'm working on. But I'm also keeping it true: The Roots/Bilal/Kimbra (w/ Wendy Melvoin, DD Jackson & Ray Angry) pulled out of these Bowie gigs. We have patience. But we do NOT have patience for the #Bitchassness. Enjoy your precious equipment."

Embody #bitchassness, get third-degree burned by Questo. Simple as that.

Watch an archival Fuse x Questlove interview: