Baird sang and played lute, glockenspiel, cittern, dulcimer, twelve string guitar and percussion. Gladwin sang and played twelve-string guitar, lute, double bass, theorbo, cittern, tabor and tubular bells. Their instruments include Celtic harp, Swedish nyckelharpa, hurdy-gurdy, bagpipes, cittern, flutes, and many others. He taught and wrote music for lute, cittern, orpharion, bandora, viol, and voice. There is a tendency in modern German to interchange the words for cittern and zither. The cittern family survives as the Corsican cetara and the Portuguese guitar. There are other tunings for the cittern. The cittern is one of the few metal-strung instruments known from the Renaissance period. Similar instruments include the cittern, orpharion and bandora. A musical instrument, the cittern, lies on the chair with musical notebooks. Martin Luther was popularly said to have played a similar cittern at the Wartburg. It is a type of cittern that has nine steel strings in five courses. These variants all use metal strings, similar to the cittern. The Italian citole, known there as "cetra", eventually became the cittern. In Germany the cittern survives under the names "Waldzither" and "Lutherzither".