Ryan Seacrest and Clear Channel Communications have some impressively deep Rolodexes: Over a star-studded five hours Saturday evening at the MGM Grand Garden Arena in Las Vegas, the hosts of Night 2 of the I Heart Radio music festival delivered a bill that included, in order of appearance (roughly): Steven Tyler, Jeff Beck, Sting, Randy Jackson, a few members of Sly Stone’s Family Stone, Nicki Minaj, Karmin, Rascal Flatts, Jennifer Lopez, David Guetta, Usher, Kenny Chesney, Lady Gaga and Sting.