The band have now released two lyric videos for the tracks.
The band, who will play this year's Olympic closing ceremony
alongside New Order and the Specials, were debuting their first new
music since 2010.
The quartet, led by Dr Dee creator Damon Albarn,
played two songs -Under the Westway and The
Puritan - from a rooftop in West London.
The performances were streamed via the band's website and
the social networking site Twitter.
The "Westway", part of the A40 road through West London which
was also mentioned in the group's early hit For Tomorrow, can
be seen in the background as the band play.
Between the songs, the band undertook a Twitter question and
answer session with fans, during which they confirmed that the new
tracks would be included in their set for next month's Olympic