[citation needed] Hallett's instruments have included Norwegian Hardanger fiddle, saw, accordion, found objects such as a bicycle wheel, at times modified by electronics.

She has also collaborated with artists such as Lol Coxhill, Phil Minton, Maggie Nicols, Evan Parker, and with theatres and dance projects.

[1] Hallett made several solo recordings, which include improvisations, songs and "tape collage pieces" from her works for the stage.

[3] Martin Longley comments that while Bell plays mainly reed and pipe instruments from places such as South East Asia, Hallett included a saw, a bicycle wheel mounted on a spindle, and the viola, on most improvisations modified by electronics.

The reviewer describes an atmosphere of "suspended meditation, sustained for over an hour with some extremely varied and resourceful spontaneity",[3] with the sound of the bicycle wheel "uncannily similar to her viola or sarangi, but just a touch rougher".