“A Case of Musical Preference for Johnny Cash Following Deep Brain Stimulation of the Nucleus Accumbens,” Frontiers in Behavioral Neuroscience, posted onlne May 9, 2014.
Open access. Some months after stimulation, the subject, who had OCD, was listening to the radio, when he coincidentally heard “Ring of Fire” and was deeply affected by the song. See also this write-up in the U.K. Independent.