Tom Petty has been fronting the Heartbreakers for over 30 years now, and the group has delivered a high level of no-frills, classy, and reconstituted American garage rock through all of it. On the group's first effort since 2002’s The Last DJ, Petty changes things up by tackling the blues. Mojo grafts the Heartbreakers' patented sound to the Chicago blues music that appeared on Chess Records in the '50s. The playing is solid throughout, especially Campbell's clear and precise slide guitar leads.