Ask us style of jazz usually written for piano combined European musical forms with African syncopated rhythms?

The style of jazz you're referring to is known as "ragtime." It emerged in the late 19th century and is characterized by its syncopated rhythms and lively melodies, often played on the piano. Ragtime combines European musical structures, such as marches and waltzes, with African American musical elements, resulting in a distinct and energetic sound that laid the groundwork for later jazz genres. Scott Joplin is one of the most famous composers associated with this style.