Question: Who composed the official debut single of the singer who signed a major record deal with Hollywood Records on August 8, 2012, and started recording songs for her debut album on August 12, 2012?
Sentence (from "Tove Lo discography"): Lo's first EP, "Truth Serum", was released under the label on 3 March 2014, and entered the top 20 in Norway and Sweden.
Relevant evidence: No