As Peter Wolf crouched over the microphone at the front of the stage, guitarist J. Geils stood next to him, eyes closed, playing the frantic refrain of “Lookin’ for a Love” to a delirious Fenway Park crowd.

The sold-out concert in 2010 was a triumph for the J. Geils Band, the venerable Boston rockers who had broken up years before but now, older and wiser and motivated by a desire to make some money, were setting aside their differences to put on a show.