Consider your audition. Select music that fits the situation. If you're auditioning for a Broadway musical, be sure to select only tunes that will showcase your ability to play in the Broadway style. Be careful not to select songs that are too simple, but you don't want to choose songs so difficult that you'll risk blowing the audition. Find a good balance of songs that will are complex enough to showcase your ability to play, but ensure they are songs you know so well that your odds of making a mistake are narrow.
Select songs that showcase your range. This is important when auditioning for a school of performing arts. Classical pieces will probably make up the bulk of your audition, but including at a couple of songs from other genres will show your ability to play well in different styles. Don't be afraid to include a well-written original piece in your audition as well.
Select piano music about which you're passionate. Filling your audition program with songs you love will allow you to play emotionally charged auditions. Delivering a song with passion can sometime override minor flaws in your piano technique.
Choose at least two classical pieces that contrast. Ideally, include something classical from two or more of the musical periods (Baroque, Classical, Romantic, or 20th-century). This may be required for some auditions, but it's a good idea for any piano audition, to help showcase your knowledge of the instrument and its origins.
Consider including compositions not heard as frequently during auditions. Famous works by Mozart, Bach, Beethoven and Chopin are done frequently. Find lesser known works by these composers, or choose work from composers that is infrequently played during auditions. This can help give your audition a fresh appeal.