Which idiom combines regular, sectional formal structure, an emphasis on works for piano, and syncopated rhythms influenced by African music?

The idiom that combines regular, sectional formal structure, an emphasis on works for piano, and syncopated rhythms influenced by African music is ragtime

Explanation:

The origins of ragtime where in St. Louis is had a fast impact on the popular culture. Ragtime was an influence on early jazz, and it was wildly known and dance, it even made its way to Europe when some bands added this kind of song in their repertory, most of the songs where principally composed to be played on the piano.