City of bones

Today I saw a film called The Mortal Instruments: City of Bones. I liked it very much and.And I like Jamie and Lily very much ,too. It's a pity that they broke up are broken up now. The music in the film, heart by heart ,is (also) very good!!! I enjoyed it so much!

I guess what you want to say with "heart by heart" is that you really think the music is good. In English, the closest translation to "heart by heart" is "hand on heart", however this is used to emphasise telling the truth. As you are giving an opinion, you wouldn't really need to emphasise telling the truth. To add emphasis you could say, "I also really think the music is the film is so good/very good!".