vibrate together. The instruments may have either one or two pairs of strings and may either be plucked or struck with bamboo sticks. The Maranao call their zither . The Isneg call theirs (or variants , and ). Playing methods The Kalinga's six-stringed kulibet is held in the player's hands and plucked. The player uses thumbs on two strings and his middle and index fingers for the other four, plucking alternately with each side to sustain a melody. The Isneg play their five-stringed in the same manner, plucking with thumbs and fingers. The Ilongglot have a way for two people to play one instrument, the man holding the five-string in his hands, the woman beating percussion on the strings with bamboo sticks. The subanun play with the holder plucking and the person with sticks tapping the body of the instrument with sticks. The Truray do the same, but it is specifically two women that play with way. For some entertainment, such as dancing, some groups pair the tube-zither with 2-string kudlong lute, including the Bilaan, T'boli, Vukidnon Matigsalug. India The Rudra veena (different from the Saraswati veena) is a plucked instrument, a wood or bamboo tube that holds strings and fretboard and has 2 gourd resonators. Early forms included the Alapini Vina and Eka-tantri Vina. Organologists have placed the Rudra veena in different positions in their classifications, either as a bar zither or as a tube zither. As a tube zither, there is a historical connection to other tube zithers. Southeast Asia has a wide variety of development for tube zithers and can't be excluded as the developers of this style of instrument. The tube zithers may have moved from Southeast Asia to Northern India by way of overland trade. The more mainstream view shows stick-zithers with gourds (looking much like the Rudra Veena as possibly a pre-bamboo tube form) went from India to Java. Half-tube zithers Musicians have to deal with the shape of their instruments. One method was to attach a gourd to rest the instrument on the ground or lap, or press against the musician's chest. Splitting the bamboo tube in half created an instrument that could lie flat stably. Asian zither In antiquity, the Chinese guzheng may have originally been a bamboo-tube zither. That was what was described in the Shuowen Jiezi. Kurt Sachs pointed out that bamboo large enough to form the body of a