That sounds absolutely great. Perfect for the Journal. It perhaps would have an element of soap opera to it - I mean that respectfully - in that there'll be several episodes and readers may get 'hooked'? Dickens used the same technique to suck readers in...
Good Tweet material too, plus excellent for forums. Could you take a camera along to rehearsals? Musicians photograph well. The Journal likes a 500 px image width....
I see the Harvard Wind Ensemble is quite famous. It's been going for 50 years and premiered P.D.Q. Bach! http://www.hcs.harvard.edu/~hwe/About.html
If Nick or I can help with typesetting or anything else, just say.
The only thing that occurs to me - which has surely occurred to you and you've got it in hand - is you may have to tread carefully about mentioning individuals, e.g. check draft copy with them first which may slow things up a bit. But as they've
to blog that changes the dynamic. It's as if you've been appointed the project historian. That gives you a lot of freedom to write what you want. They probably want the publicity. Good. They can publicise the Journal, and IMSLP generally, on Harvard sites.