6. Agnetha Fältskog
Perhaps the most unexpected comeback to be featured in this list is that of former-ABBA Goddess, Agnetha Fältskog. Fältskog's solo releases have been sporadic with the singer usually remaining tight-lipped about her upcoming work. To the delight of ABBA fans, Fältskog's manager confirmed that the singer is in the process of recording a new English album with Jörgen Elofsson (the man behind many solid Westlife and Britney Spears hits). Rumours also imply that the singer has recorded a duet with Gary Barlow, which could potentially bring some mainstream publicity and interest to the album. Surely if Agnetha from ABBA cannot save the pop world, then no one can. http://www.youtube.com/watch?v=_FlfkjRvVs4