The manga is really good. It first starts off slow, introducing the characters systematically and then later in the series, it gets better and better as the female lead meets up with guys that eventually falls in love with her. It's cute seeing how that happens, as it's more in pace with real-life, rather than other shoujo mangas which have the guys falling for the girls almost immediately (too fast).
Another bonus for this manga is the classical music -centered plot. The female lead doesn't know any real music for the first start, so she kind of relates with most (or some) or the female readers here, giving them space to fantasize, etc.
It's really good, reading this manga as the artwork is clean and there aren't too many speeches. Mostly the plot centres on the female lead's dilemma to do well in music, facing a few obstacles on the way.
Personally, the anime does the manga no justice. So if it's possible, read the manga before watching the anime. Or.. if you've read the manga, then don't watch the anime. However, if you're not planning to read the manga, I guess it's not too bad to try and watch the anime. But let me warn you, it would not be as smashing as the manga! 😀