John Adams - El Nino - C o' D

Okay, I haven't heard this but pretty sure it's a C all the way based on what I know of his previous work. Bobby Spano and the Hotlanta Symphony Orchestra are performing it this May, tickets are a little pricey but not insane. I should go to this, right? Who's heard it? Details, thoughts, insight - gimme gimme. (Particularly interested in comments from Mr. Easton here).