As often, as possible, surprise the reader or listener with something different that's at least as good as the expected. Examples:
In writing dialogue, have the protagonists say the non-obvious. Of course, the dialogue must be credible and true to the character's personality.
In writing music, look for opportunities to use a non-obvious chord or next melody note, as long as it doesn't destroy the piece's ethos--don't be different just to be different.
In performing dialogue or music, look for non-standard ways to say a word or play the phrase. The classic example of this is when a furious actor whispers, or a performer allows an unexpectedly long breath between sentences.