Q: Passage: "This Life" is the theme song for the FX television series Sons of Anarchy, written by singer-songwriter Curtis Stigers, Velvet Revolver guitarist Dave Kushner, producer Bob Thiele Jr. and show creator Kurt Sutter while it was performed by Curtis Stigers & The Forest Rangers.

Question: Based on this passage, who sings the theme song from sons of anarchy?
Let's give stream of consciousness below

This is the relevant information: "This Life" is the theme song for the FX television series Sons of Anarchy, written by singer-songwriter Curtis Stigers, Velvet Revolver guitarist Dave Kushner, producer Bob Thiele Jr. and show creator Kurt Sutter while it was performed by Curtis Stigers & The Forest Rangers. So the answer is Curtis Stigers & The Forest Rangers.