"Playing is one of the key elements that make Sinfonia a powerful performance instrument. With PLAY, Sinfonia becomes truly expressive, following a conductor or stage action just like any other live element in the performance. With each hit of the PLAY key, the music moves along at the assigned tap value (quarter, eighth, half, etc.) thereby following the tempo of the player's performance. There are multiple PLAY keys - in addition to the key labeled 'Play', each key with a downward pointing arrow is a Play key. The various Play keys are functionally identical and are there to allow for a more comfortable, pianistic performance. The Play Indicator on the computer screen displays the current Play resolution.. Also, the piano-conductor score will communicate what beat was assigned to the play key in any given measure. Most songs will be played in one duration throughout the entire song, unless certain time signatures or musical phrases make a change in the play beat more intuitive. Once a song has been loaded, you may choose to begin playing the song by pressing the play key in a rhythm following the conductor or performer. "