Five years after Rihanna and Kanye West released the Grammy Award-winning hit “All Of the Lights,” the musical duo has collaborated once more on a brand new song.

During the iHeartMedia Music Summit in California this week, the rapper made a surprise appearance during a Def Jam presentation to preview some of his own new recordings – one of which was a previously unheard duet with Rihanna.

Def Jam CEO Steve Bartels was in the middle of his presentation when he unexpectedly invited Kanye to the stage, telling the crowd: "I wanna stop this and turn it over to one of the great iconic rock stars of our time: Kanye West."

A source told Billboard magazine that Kanye dropped the mic and proceeded to give a 45-minute speech about the radio industry and Daft Punk before previewing the track, telling the audience that he has a “responsibility to innovate.”

"This little talk I'm giving is going good so far, so I have to risk being Kanye," he said.

The song, which is so far untitled, reportedly featured acoustic guitars, a soaring chorus and a catchy melody. The source revealed that after the track played out, Kim Kardashian’s husband closed his laptop and left the stage without saying a word while the audience cheered and gave him a standing ovation.

During his presentation, Kanye also reportedly sang an impressive a capella version of his duet with Paul McCartney, “Only One.”

Kanye and Rihanna won the Grammy Award for Best Rap/Sung Collaboration and Best Rap Song for their 2010 single, “All of the Lights.” They’ve also collaborated together on another Grammy Award-winning hit, 2009’s “Run This Town” with Jay Z.