Question: When did the artist who released Truth Serum form Tremblebee?
Context: Truth Serum is an independent comic book series created, written and drawn by author Jon Adams. "Not on Drugs" is a song by Swedish recording artist and songwriter Tove Lo for her debut extended play "Truth Serum" and her debut studio album "Queen of the Clouds", both of which were released in 2014.  It was co-written by Lo together with its producers, Alx Reuterskiöld and The Struts.  The recording premiered on 24 February 2014 on Swedish radio station P3 as a promotional single from "Truth Serum".  After the release of "Queen of the Clouds", it was sent to American modern rock radio stations on 25 November 2014.  The track is, however, not considered part of the promotion for the record, since its other scheduled releases were cancelled in order to promote "Talking Body", the album's second single. "Habits (Stay High)" is a song recorded by Swedish singer Tove Lo from her debut extended play (EP), "Truth Serum", and her debut studio album, "Queen of the Clouds" (2014).  It was written by Lo with Ludvig Söderberg and Jakob Jerlström, while it was produced by the latter two under the production name The Struts.  Initially, the singer self-released the song under the title "Habits" on 25 March 2013 as her second independently-released single.  After Lo was signed to Universal Music, the track was re-released on 6 December 2013 under the title of "Habits (Stay High)" as both the second single from "Truth Serum" and the lead single from "Queen of the Clouds".  Musically, it is a pop and electropop song which features a minimal and upbeat electronic instrumentation.  Its lyrics delve into the singer's attempts to forget her previous boyfriend through substance abuse, drinking and other hedonistic practices.  Consequently, some critics and Lo herself noted a contrast between the song's production and its lyrical content. Ebba Tove Elsa Nilsson (born 29 October 1987), known professionally as Tove Lo ( , ] ), is a Swedish singer and songwriter.  She was born and raised in the affluent Djursholm district of Danderyd Municipality, just north of Stockholm, where she graduated from musical magnet school "Rytmus Musikergymnasiet".  She formed the Swedish rock band "Tremblebee" in 2006.  Following the disbanding of Tremblebee, she pursued a career in songwriting and earned a publishing deal with Warner/Chappell Music in 2011.  Working with producers Alexander Kronlund, Max Martin, and Xenomania, she became a successful songwriter recording and independently releasing her own compositions.  In 2014, she was signed to Max Martin's songwriting collective Wolf Cousins and was offered a recording deal.  She signed to the American label Island and Polydor Records in the UK. Queen of the Clouds is the debut studio album by Swedish singer Tove Lo.  It was released on 24 September 2014 by Island Records.  The album follows her first extended play "Truth Serum" (2014) and includes the successful singles "Habits (Stay High)" and "Talking Body".  Lo worked with several writers and producers such as The Struts, Klas Åhlund, Alexander Kronlund, Alx Reuterskiöld, and Captain Cuts.  Lyrically, the album's themes center on the stages of a relationship, including passion, love and break-ups. "Out of Mind" is a song by Swedish recording artist Tove Lo for her debut extended play, "Truth Serum" (2014).  It was written by Lo alongside Alx Reuterskiöld and produced by The Struts with Reuterskiöld.  The song was released on 16 October 2013 as the lead single from "Truth Serum" by Universal Music.  It was also her third single overall, after "Love Ballad" and "Habits". Swedish singer and songwriter Tove Lo has released two studio albums, one extended play (EP), nineteen singles (including seven as a featured artist), three promotional singles and fifteen music videos. Lo started her career as the lead singer and songwriter in math rock band Tremblebee from 2006 until 2009.  In 2011, she signed a publishing deal with Warner/Chappell Music, and started recording songs.  She self-released "Love Ballad" as her debut single in October 2012.  The next year, Lo released "Habits", which received positive feedback from music blogs and led her to sign a record deal with Universal Music Group.  Lo's first EP, "Truth Serum", was released under the label on 3 March 2014, and entered the top 20 in Norway and Sweden.  Three singles were released from the EP, including a remixed version of "Habits" by production duo Hippie Sabotage, re-titled as "Stay High".  The track peaked at number 13 in Sweden and reached the top ten of the charts in Australia, New Zealand, and the United Kingdom. "Truth serum" is a colloquial name for any of a range of psychoactive drugs used in an effort to obtain information from subjects who are unable or unwilling to provide it otherwise.  These include ethanol, scopolamine, 3-quinuclidinyl benzilate, midazolam, flunitrazepam, sodium thiopental, and amobarbital, among others. Truth Serum is the debut extended play (EP) by Swedish recording artist Tove Lo.  The singer signed a publishing deal with Warner/Chappell Music in 2011, which led her to write songs for artists like Girls Aloud and Icona Pop.  Around that time, she was going through a hard situation in a relationship, so she eventually started composing tracks related to that matter.  She then decided to keep those tracks for herself as she considered them too personal.  Lo independently released two of the songs as singles, "Love Ballad" in October 2012, and "Habits" in March 2013.  Their popularity gained the singer a record deal with Universal Records in 2013.  The EP was eventually released through the label to digital retailers on 3 March 2014. The serum amyloid P component (SAP) is the identical serum form of amyloid P component (AP), a 25kDa pentameric protein first identified as the pentagonal constituent of in vivo pathological deposits called "amyloid".  APCS is its human gene.
Answer: 2006