This year’s “A Capitol Fourth” on PBS welcomes back host Tom Bergeron, the two-time Emmy Award-winning television personality (“Dancing With the Stars”), and stars music legend Barry Manilow. Back by popular demand following his powerful debut performance on the show in 2009, Manilow will lead an all-star cast, including Candice Glover, the Season 12 winner of “American Idol;” country music artist and “American Idol” winner Scotty McCeery; actor and singer Darren Criss (“Glee”); musical prodigy and classical crossover star Jackie Evancho; Broadway and television star Megan Hilty (“Smash”); Broadway’s new hit “Motown The Musical;” and five-time Academy Award-winner John Williams conducting music from the Oscar-winning blockbuster “Lincoln,” with the National Symphony Orchestra under the direction of top pops conductor Jack Everly.