Kaikan Phrase

Both show the struggle in making a band/making it big. Also both have romace. One of the difference would be that nana focuses a lot more on the relationship aspects. 

Both have elements of music and romance. Kaikan Phrase, it centers around Bishounen (Beautiful males) while Nana centers aruond women and their relationships. Kaikan Phrase show more of the Japanese Pop-Rock or J-rock scene then punk. Kaikan phrase outlines the difficulties met by a band called Lucifer, a chronicle of their journey to becoming succesful and the hardships that come afterward. You have romance, deceit, betrayal, lust, love. All wrapped up in a convenient show. Animation is older, but well worth watching. 

The top is always hardest to get to because once you're up, you have to process how to get down as well. However, with these two there is no coming back down because the top is where they feel they belong most and the one driving them to these extents is the power of their love for music. The music presented is great and the characters all have their individual special traits that you can both pick apart and love.  

We have a music anime that is very focused in showing the hardship of getting popular within music in Kaikan Phrase while still having time to show hardships in relationships and everything that go along with it. In Nana it focuses more on relationships at first, and then the music world - and the hardships that go along with that. Chances are you watched Nana, and if you do I recommend you to look up Kaikan Phrase. They feel very similar even though it has a male main cast. Kaikan Phrase does not have the most modern animation quality as it is from the early 2000's, but I hope you will give it a shot - as it is definetly worth your time. read more 

Music from Λucifer (Lucifer). The first half of the anime is devoted to how the group forms and the many hardships they face in becoming a band. The second half of the anime picks up on the manga, following the romance of Aine and Sakuya. Good music. 

In both anime amateur rock bands try to make it big in music industry, and plots mainly focus on the struggles of those who are involved. 

Both are abt bands who dream of making it to the big time. Great musicand drama are included 

same genre, same theme, Girl falls for boy except in Uta no prince-sama the guy is an idol where as kaikan phrase the boy the lead girl falls for is a rock star and she composes music for him. Sooo its very much similar with slight differences but totally worth the watch (: 

Both are about musicians, about bands that are very good, that are trying to get famous and succeed. Gravitation is a little more about romance between two guys, while Kaikan Phrase is more about music and the love there is between a boy and a girl.