“Harder” was a song developed for 2000’s All That You Can’t Leave Behind.
In 2003, the Rock and Roll Hall of Fame in Cleveland Ohio opened a U2 exhibit, with multiple floors focused on U2. As part of that exhibit there was a notebook of song titles that were identified as having belonged to the recording sessions for All That You Can’t Leave Behind. The list for this album was long, containing 53 different titles. A few of these songs were eventually released such as “Sometimes You Can’t Make It On Your Own” (here it was marked the DooWop Version), “Miracle Drug”, “Grace” (listed here as the TV mix), “A Man and a Woman” (A note says that Bono and Brian call this “Boomerang 3”), “Love and Peace”, “Stuck” (a note says to work on the song with three different vocal approaches), and “Always” (with the “With or Without You” vocal approach). In the notes beside each song are clues to what the song was, or what work was left on the song.
“Harder” was one of these songs. It’s included on one line with two other titles, “Night Shift” and “Love and Peace”. It is not known if this is three separate songs that they were working on as a group, or if they are multiple titles for one song.