One of the things II like in indie music is the unpredictableness of the artists and the song itself. Unlike with the other usual songs we hear from the radio, indie music is a kind of music that you would want to hear every now and then because of its uniqueness.
For indie artists, knowing what people seek in a song, you must be unpredictable. Catch their attention. Since indie songs are not as popular as rock, pop, or jazz songs, when people got to hear this the first time, your song must make an impact to them so that they will seek for your song every now and then.