U2 on the '360 Tour' stage

It's a new music bonanza for fans of the Irish super group U2. After premiering three new tracks at their tour-opening show in Milan, U2 have introduced their delighted fans to yet another new track, titled 'Every Breaking Wave,' in Helsinki, Finland on Saturday.

'Like every breaking wave on the shore, this is as far as I can reach,' Bono sang during the soaring acoustic number. 'No one has heard that before - not even us,' he told the crowd when the song ended.

'Every Breaking Wave' was originally intended for 'No Line on the Horizon,' U2 told the press last year, but was it later selected as the first single for U2's follow-up album 'Songs of Ascent.'

The band has also debuted 'Return of the Sting Ray Guitar,' 'North Star' and 'Glastonbury' on the European leg of their 360 Tour.

In addition to the forthcoming 'Songs of Ascent' and the 'Spider-man: Turn Off the Dark' Broadway musical, U2 are also rumored to be working on a rock album and a club-sounding album.

Bono predicts that by the time their tour reaches the U.S. in 2011, fans are going to have tickets to a whole new show with new songs.