As the co-founder of Roc-A-Fella Records, Jay-Z continued to push the boundaries of hip-hop with -era Kanye West, J. Cole, and other notable artists. During this period, Jay-Z released The Blue Print 3 (2007) and The City's on Lockdown -era D.O.A. (Death of Auto-Tune) (2008), a scathing critique of the auto-tune era.