4x4 (feat. Nelly)

This song finds Miley collaborating with Pharrell Williams, who as part of The Neptunes, has produced numerous hit singles for various musicians. Cyrus told Billboard magazine how she mapped out a new sonic vision with Williams in Miami. "We wanted to make something really different," she said. "He came to my house, and I didn't have shoes on-I don't put a show on for anybody. He said, 'This is why I love you: You're just wild and free, and I want to capture that.'" This was the second song the pair wrote together and Pharrell described it as a union of "foreign elements."

This rhythmic hoedown features Nelly. "It's kind of a country, hip-hop, pop feel, if you can believe that," the St. Louis rapper told MTV News. "It's about having fun; kind of how a 4x4 truck symbolizes rebelliousness ... you know, mashing out, wanting to ride with the bad boys. It's a dope track."

Cyrus both raps and sings on the track, and Nelly complimented the ex Hannah Montana star's skills on the mic. "She grew up with hip hop. Hip hop is a way of life, she's not a rapper but she loves hip hop. It's about how she expresses herself," he explained to MTV News. "I know a lot of kids her age that are just like her; they grew up loving this music. People act like they want her to be 30 years old; she's not even 21, she has no kids, she's been working with Disney for her whole life, she wants to have some fun."