The recruitment of Jaco Pastorius helped to push Weather Report to the height of its popularity. Already a rising star in his own right, Pastorius brought a very musical, melodic quality to the bass. He could play muscular, lightning-fast groove lines influenced by R&B or funk, as well as demonstrating an extraordinary solo control of tone and string harmonics, often sounding more like a horn player. Pastorius was also a multi-instrumentalist (contributing drums, steel pan, and mandocello to the latest recording sessions), a gifted composer (eventually responsible for some signature Weather Report pieces such as "Teen Town" and "Three Views of a Secret"), and a useful production foil for Zawinul due to his knowledge of recording studios and techniques. Finally, Pastorius' stagecraft and aggressive showmanship helped the band to bring in a new audience.