With his soul-infused folk, Matt Cranstoun’s music has a possessive mixture of character and earnestness. The Brooklyn-based singer released his sophomore album “The Last Drop of Color” last fall and has spent the past few months on stage set to an energetic “big band” supporting group. Complete with choral-like gospel singers and horn section, the album comes alive with the energetic backing band, showing the vulnerable but spirited singer at his best and charging his up already electric indie rock. Cranstoun and company will be performing their final show in the series at Rockwood Music Hall on May 15. – Devon Antonetti