A compact piano is a type of keyboard instrument that is smaller than a traditional UPRIGHT or grand piano. The two most common types of compact pianos are the UPRIGHT and the SPINET. An UPRIGHT piano is a vertical piano with the strings and soundboard running parallel to the floor. A SPINET piano is a smaller version of an UPRIGHT piano, with the strings and soundboard running perpendicular to the floor. Both types of compact pianos are ideal for small spaces and offer a great sound quality.