
Katy Perry co-wrote Iggy Azalea's hit single "Black Widow." Perry was originally going to sing on the track, but she couldn't fit it into her schedule, so Rita Ora provided the sung vocals instead.

James Brown's "Get Up (I Feel Like Being a) Sex Machine" was the first Hot 100 hit with the word "sex" in the title.

The voice of Waldo in Van Halen's "Hot For Teacher" video was the late Phil Hartman of Saturday Night Live Fame.

A perfume called Wonderstruck was named after a line in Taylor Swift's song "Enchanted": "I'm wonderstruck, blushing all the way home."
The "Doctor of philosophy" in the Indigo Girls' song "Closer To Fine" is based on a teacher Emily Saliers had who had a poster of Rasputin on his door.
The first rap song to make the Hot 100 was "Rapper's Delight" by The Sugarhill Gang in 1979. At the time, many considered rap a fad that would soon pass.
It started with a bouncy MTV classic. Nirvana and MCR made them scary, then Gwen, Avril and Madonna put on the pom poms.
When Judd Apatow needed under-appreciated rockers for his Knocked Up sequel, he immediately thought of Parker, who just happened to be getting his band The Rumour back together.
A big list of musical marriages and family relations ranging from the simple to the truly dysfunctional.
Billy Joel and Hall & Oates hated making videos, so they chose a director with similar contempt for the medium. That was Jay Dubin, and he has a lot to say on the subject.
The lead singer on "Da Doo Ron Ron" and "Then He Kissed Me," La La explains how and why Phil Spector replaced The Crystals with Darlene Love on "He's A Rebel."
Christopher Cross with Deep Purple? Kenny Loggins in Caddyshack? A Fact or Fiction all about yacht rock and those who made it.