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.

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.

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.