His collection included guitars, mandolins, flutes, clarinets, saxophones, accordions, and a piano. Nowadays, Hohner produces harmonicas, melodicas, accordions and recorder flutes. Other instruments may include trumpets, violins, and accordions. Accordions and concertinas are also common, and other instruments are sometimes used. Tuned reeds (as in harmonicas and accordions) are made of metal or synthetics. Laurent Petitgand contributed the circus music, an ensemble work performed with accordions, saxophones and keyboards. The jota is common, here played with triangles, castanets, guitars, tambourines, accordions and zambombas. There are no accordions nor woodwinds. Celluloid remains in use for musical instruments, especially accordions and guitars. A concertina is a free-reed musical instrument, like the various accordions and the harmonica. Meanwhile, others explored alternative instrumentation, including accordions, strings and chromatic percussion. Later, the harmonium and various types of accordions were also used. Some free-reed instrument keyboards such as accordions and Indian harmoniums include microtones. All instruments have reed ranks of some format, apart from reedless digital accordions. Various hybrid accordions have been created between instruments of different buttonboards and actions.