We hear this a lot! So here's what you can expect. Accompanists play instruments like a keyboard or guitar and support vocalists, dancers, and theater performers. Accompanists wear a lot of different hats; for example, they may accompany the church choir as pianists and/or accompany guest performers for a segments for a television show. A collaborative pianist typically performs with vocalists and dancers in a rehearsal setting. Lots of accompanists double as teachers or educators and are capable of teaching and supporting a student's performance while playing as well.
Here's what they don't tell you! Accompanists must respond quickly to performance elements such as tempo, key changes, phrasing, and interpretation, often while collaborating with a singer for the first time and often in high-pressure settings like competitions and/or auditions. Most accompanists work on a different schedule every week, but there are full-time positions at music schools have more consistency, but beware rehearsals and performances are often scheduled at night and on weekends.