Bieber's "Boyfriend" lyrics are more assertive than his past credits

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　　Is Justin Bieber feeling the pressure to abandon bubblegum pop now that he's 18?

　　"Boyfriend," the first single from Bieber's new album, "Believe," is a departure from his tween pop hits "Baby," "Somebody To Love" and "Never Say Never."

　　The collaboration with Mike Posner actually sounds like a slower version of Justin Timberlake's "Like I Love You," his 2002, post-N'Sync solo debut.

　　Both songs thrive on pronounced electric guitar melodies, throbbing hip-hop beats and a mix of rapped and sung lyrics.

　　Bieber's "Boyfriend" lyrics are more assertive than his past credits, and are sung more provocatively: "I'd like to be everything you want. Hey girl, let me talk to you."

　　Considering how smoothly Timberlake transitioned from being a teen idol to a successful adult star, the new direction is a smart move for Bieber.

　　Comparisons to Timberlake are not surprising. Before Bieber was discovered, he posted a video of himself singing Timberlake's "Cry Me A River" while playing acoustic guitar. Though Bieber ultimately signed a deal with Usher, Timberlake had also expressed interest in signing him.

　　"He's growing as well as his fans are growing. He's progressing so he has to make sure that his music fits where his fans are," he said in an exclusive interview with Yahoo! Music. "His fans from the 'Baby' days, they like 'Baby,' but they probably won't be people that listen to 'Baby,' next year."

　　Harrell said Bieber's team wanted the evolution of his sound to feel natural.