... Sorry, it's not acting, it's dancing.
If you don't feel an emotion, why on Earth should you try to express it?
And if you feel something, you'll express it naturally, depending on the mood, your partner, your music and so on.
I wasn't suggesting that anyone should fabricate an emotion, or pretend to have one.
Music can stimulate emotions, the same as lyrics, or just the sound of someone's voice can. If a dancer wants to convey emotional expression, and not all of them do, those things are good sources to evoke emotions.
Music makes me feel all sorts of things, and I like to let my dance be influenced by those feelings. On the other hand, I see lots of dancers who are apparently un-influenced by the emotions of the music.