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The trikitixa or eskusoinu ("hand sound") is a two-row Basque diatonic button accordion, with right-hand rows keyed a fifth apart and twelve unisonoric bass buttons. The trikitixa is known since the early 19th century, when it was imported to Basque Country through Italy and the port Bilbao. The onomatopoeia trikitixa originally referred to a traditional Basque ensemble, made up of the instrument which now bears the name as well as alboka, txistus and other instruments.