OPENING AND CLOSING: EA music chief Steve Schnur hangs with stars of his new E! Entertainment show, Opening Act, which premieres on the cable network on July 9, before he’s sent off to fetch coffee for the following (l-r): Martina McBride, Jason DeRulo, Rock Mafia’s Antonina Armato and Simon Lythgoe. The show features an artist discovered on YouTube being schooled by industry pros to open for a leading performer. (6/5p)