Apple Rush Organic Black Cherry

What exactly is the difference between black cherries and the run of the mill kind? Are they just riper, or is it a whole different style of fruit? I love regular cherry flavored things, but I'm never a huge fan of black cherry....until now. This really turned me around. I think it's because it's straight up juice and carbonated water. No sugar added. There's some apple juice in the mix as well, which is noticeable in the taste. If all black cherry were like this I would be a converted man.