An accompanist is a musician who plays an instrument, usually piano, to support another performer. When a singer performs in a recital, the accompanist plays the harmonies and musical lines that make the song feel complete. Without the accompanist, the singer would be performing alone, which can work but may sound thin or incomplete.

Being an accompanist requires special skills beyond just playing well. A good accompanist must watch and listen carefully to match the soloist's tempo and mood. If the singer slows down for dramatic effect, the accompanist must slow down too. If a violinist needs an extra breath before starting a phrase, the accompanist waits. This takes concentration, flexibility, and musical sensitivity.

Though accompanists support the main performer, their role is essential, not secondary. A skilled accompanist can make a good performance great by providing a rich musical foundation and responding to every nuance. Many famous musicians started as accompanists, learning to listen deeply and work collaboratively with others.