Noun
a musical phrase repeated over and over during a composition
Source: WordNetBoogie-Woogie style was characterized by a regular bass figure, an ostinato or riff and shifts of level in the left hand, elaborating each chord and trills and decorations in the right hand. Source: Internet
Note the C major ostinato and frequent dissonances and accidentals, including F Linear counterpoint is "a purely horizontal technique in which the integrity of the individual melodic lines is not sacrificed to harmonic considerations. Source: Internet
This style is based on two leading melodic lines (performed by soloists - akhkizkhuo) singing together with the drone or ostinato base (argizra). Source: Internet