Pop star Taylor Swift and British soul singer Sam Smith were the leaders among the 2015 Billboard Awards finalists with four nominations each after five top categories were announced on Tuesday. Swift, 25, and Smith, 22, earned nods for top artist, as well as for best female and male artist. Swift's "1989" will compete with Smith's "In the Lonely Hour" for the top album prize. The two will also go up against each other for best single, with Swift's "Shake it Off" pitted against "Stay With Me" by Smith.