Question: What is the name of the singer who performed in T in the Park 2013 and also produced a self-titled debut album which contained songs co-written with Iian Archer?
Sentence (from "T in the Park 2013"): It was the 20th Anniversary #T20 of the Scottish music festival Rihanna and Mumford and Sons were announced as the first and second headliner acts on 4 December 2012.
Relevant evidence: No