The alluring, post-apocalyptic song could well shape up to be a hit for Madonna, and she and Swift shared the stage with the ease of kindred spirits. Later in the night, Madonna presented Swift with the song of the year award for "Shake It Off," and Swift thanked "Madonna for being Madonna."
Watch Madonna Sing 'Ghosttown' With Taylor Swift at iHeartRadio Awards 2015
Swift also picked up statues for artist of the year, song of the year for "Shake It Off" and best lyrics for "Blank Space." Other iHeartRadio winners included best new artist Sam Smith; collaboration "Bang Bang" by Ariana Grande, Nicki Minajand Jessie J; dance song "Summer" by Calvin Harris; alternative rock song "Take Me to Church" by Hozier; and hip hop/R&B song "Don't Tell 'Em" by Jeremih featuring YG.