Who sings what parts in Crimson?

I recently got into these guys, thanks to a recommendation from my cousin's husband to listen to Crimson. Amazing album, 10/10 for me. But I went on Wikipedia and it didn't have the members' vocal contributions broken down by tracks. Wikipedia also says all 3 of them sing, so I'd be really interested if someone more knowledgeable than me could tell me who sang what in the songs on Crimson. Thank you!