"Lonely Day" is the Grammy nominated second single from the 2005 album Hypnotize by the band System of a Down. It was written by guitarist Daron Malakian, who also provides the track's lead vocals. "Lonely Day" is a power ballad with melancholy lyrics and features one of the most complex guitar solos of System of a Down's repertoire (the guitar work resembles that of The Animals' "House of the Rising Sun"). However, it has been criticized by Pitchfork Media for its lyrics, notably the fact that the song utilizes the double superlative "most loneliest."