Here you can listen to and download the I Knew You Were Trouble. - Karaoke Version ringtone for free. Original song by Taylor Swift. You can choose from 9 versions between 12 and 49 seconds. More ringtones in the same style are under the tags guitar, slow and funk. For iPhone or iPad download the .M4R file. For Android and other phones download the .MP3 file. More ringtones by Taylor Swift are on the artist page, the link is under the title.