But a movie can easily have 60 actors, a tale 60 characters... It's a good thing for a good purpose, something that never happened before in a guitarist world, if wverybody accepted maybe there must be something in it..
I wonder since you've mentioned it, if anyone rejected the offer precisely not understanding how you can have so many players on one song. Not because they don't want to support the charity, just this sheer technical nuance. I know I would think about it for at least a couple of seconds before saying yes.
I wonder ... if the greatest players accepted to be in that "filled room", or have a line in that chapter, who are we to say "oh, that is overloaded, what a terrible choice" to the likes of Sting, Springsteen, Beck, Clapton and so on... ??
It's called taking something at face value. First, we don't know at all what at least one member of this supergroup truly thinks about it. Everybody just says nice things and how great it is not to spoil the fun and the cause. Which IS great. Maybe some of them share some of our concerns. Heck, maybe even Mark himself shares them. Who knows? People are not obligated to accept any offer, even a charity one.
Second, if a bunch of famous people agree to do something it doesn't make it automatically good. If anything, these "let's fill a room with celebrities" types of things often end up in some kind of disaster. I remember all these all-star cast movies that flopped. Mark always says there's music and music business. This idea is perfect from a music business perspective. I hope it to generate as much money as possible.
Mark actually called it "embarrassment of riches", so even he's hinting it might be oversaturated a little bit. Because it can't be the other way around. If you put so many artists on one track for this amount of time, it's destined to be like this, you can't beat physics and make every one of these players shine and everybody happy with the result, there's just no way. I don't want to be Guy in this situation.