18-time Grammy winner Paul McCartney admitted he didn't recognize his own guitar when he first heard his 2015 collaboration FourFiveSeconds with Rihanna and Kanye West.'I didn't even know I was making a song,' the legendary 78-year-old said on Thursday's episode of The Tonight Show Starring Jimmy Fallon.'It just went on for a couple of days, and it was only two months later when I got a track sent to me.
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