 In many arias Bach uses obbligato instruments, which accompany the singer as an equal partner.These instrumental parts are frequently set in virtuoso repetitive patterns called figuration.Instruments include, in addition to the ones mentioned, flauto piccolo (sopranino recorder), violino piccolo, viola d'amore, violoncello piccolo (a smaller cello), tromba da tirarsi (slide trumpet), and corno da tirarsi.