It stopped when the author died, so it's not really completed. It's worth the read anyway; the story is well-done, and despite missing a 'climax', the point where it stopped feels fitting and not broken off at all.
Spoiler:
There's no "Yay, we achieved our goals!"-ending, but they come to terms with themselves and what music means to them. That makes the whole story feel more like an episode out of a musician's life than a rise-to-fame-story, which is completely fine by itsself :)
Oh, and you WILL cry. I didn't believe any of the comments, but the way everything slowly fades to white was simply heartbreaking....and yet so fitting. Absolutely worth reading! ♥
I still haven't started reading this manga, but i would like to... So i wanted to know if the series ware completed or if they stooped when the author passed away??? I don't mean anything bad by it.. I just want to know because i don't want to be left in the middle of reading :(