Eminem had continued recording throughout 2005, and released most of this work on his Shady Records compilation album "". He also recorded the track "Beautiful" in late 2007, which would later become the fifth and final single on Relapse, and also one of the only songs on the entire album in which Eminem recorded when he wasn't sober. Eminem began the major recording stages of "Relapse" in mid-2008, after completing a 12-step program to control his drug addiction. Record producer and long-time Detroit collaborator Jeff Bass of the Bass Brothers worked with Eminem on 25 tracks, two years after the rapper had received treatment for his sleeping pill addiction in 2005. Depressed by Proof's death, Eminem fell into a period of "writer's block", where he felt everything he wrote was not worth recording. To compensate for this, Bass chose to follow a production style that would allow the artist to rap "off the top of his head, as opposed to writing a story". Eminem would then freestyle or record vocals one line at a time before interrupting and then recording another line. At the same time, according to Eminem's song rights supervisor Joel Martin, the rapper began to collect additional songs without noticing it. He would often record or produce material initially intended for the musical projects of other artists, but end up with tracks he really liked. Eminem purchased the Effigy Studio in Ferndale, Michigan, in 2007, and ended his working relationship with much of his former production team of the 54 Sound recording studio, including the Bass Brothers. In September 2007, Dr. Dre stated his intention to dedicate two months to the production of "Relapse". Working with Dr. Dre allowed Eminem to concentrate on the processes of songwriting rather than the production, which was largely taken care of by Dre. The rapper justified his choice of using Dr. Dre for the vast majority of the production due to their long collaborative history and a musical "chemistry" only he and Dr. Dre shared. This allowed the rapper to pick the beats from Dr. Dre's catalog that challenged him rhythm-wise to experiment with different flows. The making of the album progressed at the Effigy Studio up to a year after, as recording sessions were then moved to Orlando, Florida in September 2008. By then, Eminem had begun to start writing verses again at such a pace that he often took more time to record the lyrics than write them. He credited sobriety for his new creative run, acknowledging that his mind was free of the clutter that "blocked" him during his drug abuse in the last years.