Joe Satriani is suing Coldplay for copyright infringement. This would indicate he has a point:
Do Chrissy and Gwynnie listen to a lot of Satriani? Did he absorb the melody while browsing in a Limited Express? Is it possible that it's a coincidence (one that includes a 4-bar melodic phrase captured in its entirety, including key and tempo)?
And did he steal that jacket from the touring company of Les Miz?
Whaddya think? Best answer wins a kick in the yarblockos.