Free I Ain’t Worried - Acoustic ringtone for your phone. Listen first, then download the version you like. Original song by OneRepublic. 7 versions are available, from 12 to 28 seconds. Tags: whistling, guitar and fast. Click a tag below to see more ringtones like this. Android users need the .MP3 file, iPhone users need the .M4R file. Both are free. More ringtones by OneRepublic are on the artist page, the link is under the title.