“There’s no better place to see the stars,” goes the Red Rocks Amphitheatre slogan. Come July 28, there will be no better place to see a legend. John Prine, at 72, is still kicking, telling jokes between tunes both funny and sad. The oldies haven’t gotten old (“Hello In There,” “Sam Stone”) and the newbies from 2018’s “The Tree of Forgiveness” join the unforgettable lexicon. Sure to make this Red Rocks appearance even better? The Colorado Symphony is joining.