Scott Joplin in the context of "Tone cluster"

Ragtime, also spelled rag-time or rag time, is a musical style that was popular and heavily influenced musical genres such as the Blues, and was seen in the United States from the 1890s to 1910s. Its signature trait is its syncopated or "ragged" rhythm. Ragtime was popularized during the early 20th century by composers such as Scott Joplin, James Scott, and Joseph Lamb. Ragtime pieces (often called "rags") are typically composed for and performed on the piano, though the genre has been adapted for a variety of instruments and styles.

Ragtime music originated within African American communities in the late 19th century and became a distinctly American form of popular music. It is closely related to marches. Ragtime pieces usually contain several distinct themes, often arranged in patterns of repeats and reprises. Scott Joplin, known as the "King of Ragtime", gained fame through compositions like "Maple Leaf Rag" and "The Entertainer". Ragtime influenced early jazz, Harlem stride piano, Piedmont blues, and early 20th century European classical composers such as Erik Satie, Claude Debussy, and Igor Stravinsky. Despite being overshadowed by jazz in the 1920s, ragtime has experienced several revivals, notably in the 1950s and 1970s (the latter renaissance due in large part to the use of "The Entertainer" in the film The Sting). The music was distributed primarily through sheet music and piano rolls, with some compositions adapted for other instruments and ensembles.

In tap dancing, jazz, and blues, stop-time is an accompaniment pattern interrupting, or stopping, the normal time and featuring regular accented attacks on the first beat of each or every other measure, alternating with silence or instrumental solos. Stop-time occasionally appears in ragtime music. The characteristics of stop-time are heavy accents, frequent rests, and a stereotyped cadential pattern. Stop-timing may create the impression that the tempo has changed, though it has not, as the soloist continues without accompaniment. Stop-time is common in African-American popular music including R&B, soul music, and led to the development of the break in hip hop.

Stop-time is, according to Samuel A. Floyd Jr., "a musical device in which the forward flow of the music stops, or seems to stop, suspended in a rhythmic unison, while in some cases an improvising instrumentalist or singer continues solo with the forward flow of the meter and tempo. Such stop-time moments are sometimes repeated, creating an illusion of starting and stopping, as, for example, in Scott Joplin's "The Ragtime Dance" and Jelly Roll Morton's "King Porter Stomp"."