Who released a mixtape featuring Herbert Anthony Stevens IV in 2014?
Bill
Title: Ab-Soul
Passage: Herbert Anthony Stevens IV (born February 23, 1987), better known by his stage name Ab-Soul, is an American hip hop recording artist from Carson, California.  In 2007, he signed to indie record label Top Dawg Entertainment (TDE), where he eventually formed a hip hop supergroup Black Hippy, alongside his label-mates and fellow California-based rappers Jay Rock, Kendrick Lamar and Schoolboy Q.  He is perhaps best known for his introspective lyrics and his four independent albums under TDE, "Longterm Mentality", "Control System", "These Days...", and "Do What Thou Wilt. ", which were all released to positive reviews and commercial success.
Title: Vagrant (mixtape)
Passage: Vagrant is the debut mixtape by Most Dope member Bill.  It was released as a free digital download on April 17, 2014.  It features Mac Miller and Ab-Soul, among others.
Title: John Stevens (singer)
Passage: John Bassat Stevens IV (born July 28, 1987) is an American classic pop singer and was the sixth-place finalist on the third season of the television series "American Idol".
Ab-Soul Vagrant (mixtape)