'Doing something with Chris Martin would be amazing,' says DJ
Producer says singer made 'worst mistake of her career'
[youtube]http://www.youtube.com/watch?v=d3jYN37a1_I&feature=player_embedded[/youtube] Madonna made a surprise appearance at Ultra Music Festival 14 in Miami, taking the stage to introduce Swedish DJ Avicii and his remix of her new single, “Girl Gone Wild.” “I’ve been here in ...