Here's what's going on today (Wednesday, April 4): Perhaps the most revered acoustic band in the world, Alison Krauss & Union Station, play the Johnny Mercer Theatre tonight. Inexplicably, it's not part of the Savannah Music Festival. The SMF shows are: Pianist Kevin Cole and friends have two performances (5 and 7:30 p.m.) of "Here to Stay: The Gershwin Experience" at the Morris Center. Daniel Hope performs with the German ensemble L'Arte del Mondo at 6 p.m., at the Telfair Academy. And in the non-music category, Marlon Brando's 1961 cult Western One-Eyed Jack is screened by the Psychotronic Film Society (8 p.m. at the Sentient Bean).