Since stringed musical instruments like viola, bass, cello and violin create music with strings vibrating to a certain pitch; they are known as the cousins of piano. What makes them distinct from each other is that the violinist or other string players pluck the strings with their fingers (which is instructed as pizzicato in music) while the strings of the piano are hit by the hammers to produce sound. Bass, viola cello and violin are not entirely instruments in the orchestra. Country, jazz, bluegrass and other types of music can also be created with the use of these wonderful and flexible instruments.

Piano in a way can be compared similarly to that of hammered dulcimer since the strings of the piano are being hit with the hammers for the tones to be created. Every single string of the hammered dulcimer is easily accessed by the musicians since they are exposed not like the piano. In creating chords, around four strings can be struck all at the same instance. Playing the strings in combination to create chords and melodies, the player makes use of two and at times four shaped hammers made of wood. Popular for its distinct sound, a hammered dulcimer is found widely in folk music.

The harpsichord, having the keyboard and notes produced by plucking (hitting) the strings is even more alike to the piano. Although the sound as well as the style is entirely dissimilar for both instruments, a good deal of music written for the piano can be played on the harpsichord and vice versa.

Harp, ukulele, banjo, mandolin and guitar are also classified as stringed instruments. In similar way and the same key, all of these instruments are tuned just like the piano. Unlike other instruments like the saxophone and trumpet, the pianist needs no transposition at all when using these instruments. Since the range of the piano is over eight octaves, all the notes created by these instruments can be found on it. Just like the guitar, since it only has four and a half octaves, the notes it makes can still be found on the piano's range.

Loosening or tightening the tension of the particular string is the method of tuning all stringed instruments and piano is included in the group. The string vibrates faster and at a higher frequency as it is tightened and made shorter. The pitch will be higher as the string gets thinner. The brass, bronze and other metals wrapped tightly around the piano core are the components of the lower sounding strings whereas piano wire alone is the component of higher pitched strings. The strings of piano cannot be used as guitar strings and guitar strings cannot also be used on banjo, ukulele and mandolin even though they are created of similar materials.

The strings themselves are not the only ones creating the sound of the stringed instruments, but they also are responsible for making vibrations on other parts of the instrument. A good example is the guitar. More than its back and sides, the guitar's top makes a lot of contribution to the entire sound. This also proves to be true to mandolin and other stringed instruments. Creating the beautiful melody of the piano is made possible by the important parts which are the soundboard, harp and its basic framework. The tone of the instrument will be of good quality if the components are also great. The biggest contributor to the quality of sound of the instruments is the age and type of wood being used.