The second part of the double album, "Hypnotize," was released on November 22, 2005. Like "Mezmerize" it debuted at No. 1 in the US, making System of a Down, along with The Beatles, rappers 2Pac and DMX, the only artists to ever have two studio albums debut at No. 1 in the same year. "Hypnotize" was released as the lead single and was followed by Lonely Day and Vicinity of Obscenity, all three of which were also released as EPs, including several previously-unreleased cover songs as well as a collaboration with the Wu-Tang Clan. Kill Rock 'N Roll was released as the final promotional single.