Question: Male Edition is the debut mixtape by American girl group June's Diary, the mixtape features six covers of songs originally recorded by different male groups, including which American mainstream R&B group signed through Jermaine Dupri's So So Def Recordings?
Sentence (from "Jagged Edge (group)"): In addition to writing the bulk of the group's material, the Casey brothers have also written for Usher, Nivea and Toni Braxton.
Relevant evidence: No