Guest List: Ja Rule

Ja Rule was instrumental in blurring the lines between R&B and rap during the ‘90s and ‘00s. His growl brings fierce grit to the chorus in DMX's “Grande Finale,” and he matches JAY Z's pre-pop disdain on “Can I Get A…” But he does something close to purring in openhearted verses alongside J.Lo on “I'm Real,” and he offers a sincere, melodic plea for realness on R. Kelly's “Been Around the World.”