"Dancing to a different tune" is an idiomatic expression that refers to someone who is not conforming to the norms or expectations of others. This phrase can be used to describe a person who has their own unique way of thinking, acting, or behaving.
Some synonyms that convey a similar meaning to "dancing to a different tune" include "marching to the beat of one's own drum," "swimming against the tide," "breaking the mold," "charting a different course," and "going against the grain." All of these expressions suggest that a person is taking a different path or doing something unconventional. Such a person may face resistance or disapproval from others, but they are determined to follow their own vision.