Pentatonic scale in the context of Stephen Foster

A tone cluster is a musical chord comprising at least three adjacent tones in a scale. Prototypical tone clusters are based on the chromatic scale and are separated by semitones. For instance, three adjacent piano keys (such as C, C♯, and D) struck simultaneously produce a tone cluster. Variants of the tone cluster include chords comprising adjacent tones separated diatonically, pentatonically, or microtonally. On the piano, such clusters often involve the simultaneous striking of neighboring white or black keys.

The early years of the twentieth century saw tone clusters elevated to central roles in pioneering works by ragtime artists Jelly Roll Morton and Scott Joplin. In the 1910s, two classical avant-gardists, composer-pianists Leo Ornstein and Henry Cowell, were recognized as making the first extensive explorations of the tone cluster. During the same period, Charles Ives employed them in several compositions that were not publicly performed until the late 1920s or 1930s, as did Béla Bartók in the latter decade. Since the mid-20th century, they have prominently featured in the work of composers such as Lou Harrison, Giacinto Scelsi, Alfred Schnittke and Karlheinz Stockhausen, and later Eric Whitacre. Tone clusters also play a significant role in the work of free jazz musicians such as Cecil Taylor, Matthew Shipp, and Kevin Kastning.

The krar (Geʽez: ክራር) is a five-or-six stringed bowl-shaped lyre from Ethiopia and Eritrea. It is tuned to a pentatonic scale. A modern krar may be amplified, much in the same way as an electric guitar or violin. The krar, along with the masenqo and the washint, is one of the most widespread musical instruments in Northern Ethiopia and Eritrea.

The xylophone (from Ancient Greek ξύλον (xúlon) 'wood' and φωνή (phōnḗ) 'sound, voice'; lit. 'sound of wood') is a musical instrument in the percussion family that consists of wooden bars struck by mallets. Each bar is an idiophone tuned to a pitch of a musical scale, whether pentatonic or heptatonic in the case of many African and Asian instruments, diatonic in many western children's instruments, or chromatic for orchestral use.

The term xylophone may be used generally, to include all such instruments such as the marimba, balafon and even the semantron. However, in the orchestra, the term xylophone refers specifically to a chromatic instrument of somewhat higher pitch range and drier timbre than the marimba, and these two instruments should not be confused. A person who plays the xylophone is known as a xylophonist or simply a xylophone player.

"Ol' Man River" is a show tune from the 1927 musical Show Boat with music by Jerome Kern and lyrics by Oscar Hammerstein II, who wrote the song in 1925. The song contrasts the struggles and hardships of African Americans with the endless, uncaring flow of the Mississippi River. It is sung from the point of view of a black stevedore on a showboat, and is the most famous song from the show. The song is meant to be performed in a slow tempo; it is sung complete once in the musical's lengthy first scene by the stevedore "Joe" who travels with the boat, and, in the stage version, is heard four more times in brief reprises. Joe serves as a sort of musical one-man Greek chorus, and the song, when reprised, comments on the action, as if saying, "This has happened, but the river keeps rolling on anyway."

The song is notable for several aspects: the lyrical pentatonic-scale melody, the subjects of toil and social class, the metaphor to the Mississippi, and as a bass solo (rare in musicals, solos for baritones or tenors being more common).

The zheng (pinyin: zhēng; Wade–Giles: cheng), or guzheng (Chinese: 古筝; pinyin: gǔzhēng; lit. 'ancient zheng'), is a Chinese plucked zither. The modern guzheng commonly has 21, 25, or 26 strings, is 64 inches (1.6 m; 5 ft 4 in) long, and is tuned in a major pentatonic scale. It has a large, resonant soundboard made from Paulownia wood. Other components are often made from other woods for structural or decorative reasons. Guzheng players often wear a fingerpick made from materials such as plastic, resin, tortoiseshell, or ivory on one or both hands.

It can have nylon steel strings, steel strings, silk strings, etc., depending on the genre. The most common guzheng has 21 strings. The high-pitched strings of the guzheng are close to the player, and the low-pitched strings are on the opposite side. The strings' order from the inside to the outside is 1 to 21.