Slash explained to Musicradar.com
why he hooked up with the Black Eyed Pea: "I got hip to Fergie being probably as good or better a rock singer than she is a pop singer. I heard her do Barracuda
, the old Heart song, and I was like, f---in' wow! I ended up doing a couple of shows with her where she sang Barracuda and Sweet Child o' Mine
. She's one of the most phenomenal rock 'n' roll singers, male or female, I've ever heard."