Elijah Sky Blue Allman, known professionally as P. Exeter Blue I , is an American musician, and the son of singer Cher and singer-songwriter Gregg Allman; he is the half-brother of Chaz Bono, Delilah Allman, Michael Allman, Layla Allman, and Devon Allman. He is the lead vocalist, guitarist and lyricist of the industrial rock band Deadsy.