For me, as a romantic starter, a very interesting one was Bono and Andrea Corr, that Don't Come Knocking (Bono's great work) , Summer Wine and When the Stars Go Blue.
Every U2 feat brought or took something, only important names, moments to remember.
Originally posted by LikeASong:Not officially U2 featuring X, more like the opposite, but I came across this the other day... I hadn't listened to it in a century. What a song!