As if their debut single “Only One” wasn’t enough, former Beatle bassist Paul McCartney and Yeezus rapper Kanye West have teamed up for a new single, “FourFiveSeconds,” with none other than Rihanna. The track is available for a free download at RihannaNow.com.

The acoustic track features soothing vocals from Rihanna and West, while McCartney handles the keyboard throughout. It’s unclear if the new tune will be included on anyone’s new album, but it’s certainly an interesting collaboration nonetheless.

Interestingly, Kanye West actually previewed this track at the IHeartRadio Summit in Los Angeles, where the rapper gave a 45-minute stream-of-consciousness speech about innovation, also revealing that he asked McCartney what pussy was like in the 60s. West then played the new track from his laptop, slammed it shut, and left without giving any further information.

We’ll be sure to update you about this collaboration as more information is released.