There's little question that Justin Bieber's surprise-release of "Swag," his first album in four years, on July 10 was one of the biggest bombshells of the year in the music world, and its huge first-week numbers reflect that.

Cobain delivered one of the best features on Bieber’s latest album, released on July 11, the highest-profile moment in the rapper’s career so far, with Cobain taking the opening verse on Swag’s title track.

Putting aside whatever speculation, rumors and chatter surround Justin Bieber in recent months, one thing remains certain: his talent as a musician is undeniable. Going one step further, the process of working with Bieber has largely received high praise from those collaborating on his albums.