Source: <a href=https://www.google.com/url?rct=j&sa=t&url=http://www.contactmusic.com/story/calvin-harris-to-perform-john-newman-duet-at-itunes-festival_4355302&ct=ga&cd=CAIyGjViN2YyMDkwMTU0OTZhNWQ6Y29tOmVuOlVT&usg=AFQjCNGg_epiAsXzxJzXKYscKXpMtv89wg class="colorbox" title="Calvin Harris – Calvin Harris to perform John Newman duet at iTunes Festival” >calvin harris