I would recommend Nana, Skip Beat and Paradise Kiss if you haven't already read them ^^
I always cry when I read Nana Skip Beat is also real good!
The Mangaka also did "Youth Gone Wild" but has to do with a rock band.
I realise it's wayy late to reply, but here are two others that I somewhat group in my head as similar in feeling:
http://www.mangago.zone/read-manga/ingenuo/
http://www.mangago.zone/read-manga/cipher/
(This also has a spin-off/sequel.)
You might also like:
http://www.mangago.zone/read-manga/nodame_cantabile/
(Completely different in tone, but still about the main couple's careers, and one of my top five manga.)
http://www.mangago.zone/read-manga/cat_street/
http://www.mangago.zone/read-manga/love_in_the_mask/
(A bit Korean-melodramatic, but long and absorbing.)
Can someone recommend to me manga like (the one manhau) it doesn’t have to be a manhau Preferably something with a lot of chapters
http://www.mangago.zone/read-manga/the_one/