[youtube]http://www.youtube.com/watch?v=GJgCJKqJ1cw[/youtube] The Essence Music Festival starts Friday at the Superdome. Janet Jackson headlines in her only show this year, and Raphael Saadiq plays earlier in the night. Here’s Saadiq playing “Big Easy,” a song he cut with the Rebirth Brass Band for 2008’s The Way I See It.