ABC’s broadcast of Sunday night’s Billboard Music Awards drew 8.9 million total viewers and a 2.9 demo rating, dropping 20 and 24 percent from last year to hit four-year lows (since 2012’s 7.4 mil/2.7). That said, the kudoscast -- which featured Britney Spears’ “greatest hits” medley, Madonna’s tribute to the late Prince and a Go-Gos […]