Nick Heyward is wound tighter than a watch spring as he sits down for a backstage interview in between sets at the Billboard Live Tokyo venue."God I wish I had done this (interview) before (the gig). My brain is not in gear. It (Japan) is lovely is all I can come out with," jokes the normally eloquent, articulate English singer-songwriter."I did an interview before (the gig) and it was so eloquent and flowing and lucid and calm. I've just come off stage and I am still absolutely wired. Now all I sound like is an effervescent nutcase," he adds with another chuckle.The 57-year-old Heyward, in…READ FULL ARTICLE