Ab-Soul’s “Herbert" is peppered with messages — a voicemail from his praying grandma, snippets of encouragement from his inner circle and so on. “Herbert” is named for the man behind the Ab-Soul rap persona, born Herbert Anthony Stevens IV. The music finds Ab-Soul looking back, all the way to childhood, like on the Kal Banx-produced “Hollandaise,” in which he recounts memorizing songs from '90s duo Kriss Kross and typing “freestyles” for an Internet audience via AOL dial-up.