The current issue of Relix features a photo essay by Donick Cary, the co-founder of Musack on his travels to Cuba in order to donate a guitar to a music school. In that essay, Cary, who is an Emmy-winning writer and producer (The Simpsons, Silicon Valley, Parks and Recreation, Bored to Death, New Girl) describes the creation of Musack, a 501(c)3 charity, which he notes, “provides instruments…