808s & Heartbreak, which features extensive use of the eponymous Roland TR-808 drum machine and contains themes of love, loneliness, and heartache, was released by Island Def Jam to capitalize on Thanksgiving weekend in November 2008. Reviews were positive, though slightly more mixed than his previous efforts. Despite this, the record's singles demonstrated outstanding chart performances. Upon its release, the lead single "Love Lockdown" debuted at number three on the Billboard Hot 100 and became a "Hot Shot Debut", while follow-up single "Heartless" performed similarly and became his second consecutive "Hot Shot Debut" by debuting at number four on the Billboard Hot 100. While it was criticized prior to release, 808s & Heartbreak had a significant effect on hip-hop music, encouraging other rappers to take more creative risks with their productions.

What label pushed out Kanye's fourth studio album?