For the first time in U.S. Postal Service history, a new collection of postage stamps boasts vibrant designs of mariachi musicians in traditional Charro outfits, a genre that the government entity says is an “integral element of Mexican American culture.” Each of the five new stamps features a musician, playing one of five iconic mariachi instruments: guitar, guitarrón, vihuela, violin and trumpet. The geometric shapes in the background of each stamp are a nod to Mexican villages, where mariachi music originated — and stamp designer Rafael López spent his childhood.