"I had a ball!" Jay-Z wrote on the RapRadar blog about the Wednesday concert at the University of Arizona.
But he said that during the show -- which also included performances by Third Eye Blind and The Veronicas -- he missed out on an opportunity to say something important.
"On the show as well were Third Eye Blind and Kelly Clarkson -- I thought that to be the oddest pairing EVER but, soon realized, it's what I've always professed," he wrote Thursday. "There is NO such thing as BLACK music or WHITE music, only GOOD or BAD music."
Jay-Z, who is married to fellow singer Beyonce Knowles, thought the $1 million concert was a great mix of musical talent.
"It's stupid cool to like things that are not like you, and that goes for outside of music," he wrote "If you're an African American, you can have a Jewish friend."
Although he joked that he won't be using Twitter to get his message to fans, he believes this live collaboration should be the first of many.
"I think concerts like this should happen more often -- outside of the one or two festivals a year or 'Zootopia,'" he wrote. "I'm putting that into the universe. Next up, Taylor Swift and [rapper] Uncle Murda!"