How can a composer or a performer add expression to his music?

A composer or a performer can add expression to his music by bringing out deepest feeling into it. A composer may express emotion by introducing two methods, allegro con brio and adagio cantabile, which means by playing fast or slow. A composer may also use pitches and rhythms which would be in his personal preference to bring out the passion excitement towards the audience.      

c, d, e, f, g, a, b, and c.

sometimes western music will also use solfege. the names of these are do ra me fa sol la si (or ti) and do.

to indicate a note a half step higher or lower then the original note, you would say c # (for a half a step above c) or bb (for half a step below b)