 Complete the following phrase:  Its live debut was on 18 October 1984, as an intro to The Unforgettable Fire, and the two songs were performed together at almost all Unforgettable Fire Tour shows and most Joshua Tree Tour shows. However, by the end of the Joshua Tree Tour, the band started to use MLK to precede other songs, especially One Tree Hill, and it continued in this capacity on the Lovetown Tour. It failed to appear on the Zoo TV Tour but returned to the set list on the PopMart Tour, especially after the deaths of Diana, Princess of Wales and Michael Hutchence. It went into another hiatus after PopMart, missing the entire Elevation Tour, but was notably performed as the intro to Where the Streets Have No Name at U2s appearance during the Super Bowl XXXVI halftime show in 2002. After the death of Rosa Parks, it made five Vertigo Tour appearances; in all five instances, it was sung after One to conclude the main set. MLK was a part of the main set list for the U2 360 Tour, as the prelude to Walk On. The song was dropped midway through the tour and was replaced with Scarlet. It was not played live again until 