Okay, here's what the line-up should be:
Julian Lennon - keyboards/guitar/vocals
Zak Starkey - drums
Sean Lennon - bass/vocals
James McCartney - lead guitar
Dhani Harrison - guitar/vocals
To my knowledge I've never heard Zak sing or write music. With James I've never seen him credited on vocals, so I made my line-up based on this info.
Any ideas on how many songs each member should sing lead on per album?
Sean's inclusion might be a problem 'cause Yoko still has alot of control over his career and she, wanting Sean to shine in the group might create friction within the group and cause it to split-up too early, just like she did with that other group her husband played in.[:(]