Can somebody translate 'music is in my soul' to Latin ?

Answer 1

While the answer given above is technically correct, Latin has several words for music, depending on exactly what you mean.
For example singing or playing music would be more specific. This would be rendered as cantio, cantionis. It also may refer to an incantation or spell.
In addition, carmen, carmenis can be rendered as a song, poem, prayer or magic formula. If you were specifically speaking of singing, then you might want to use yet another word.
In addition, just to be poetic, you might think of using the preposition "intra' which signifies "within." This takes the accusative case, however.
Lastly, I think that spiritus would be a more likely word to use than anima as I think it indicates a less passive quality. Either is technically correct.
The final result might be rendered adequately as:
Cantio intra meum spiritum est
If you preferred the more general form of music, the "musica" could be substituted for "cantio."

Answer 2

Not very sure but i think it's:
musica in anima mea est