The phin pia is a chest-resonated stick zither with two to five strings. It is considered the national instrument of Northern Thailand.^{[citation needed]} The one string version (equivalent to the Cambodian Kse diev) is the phin namtao.

• McGraw, Andrew (Summer–Fall 2007). "The Pia's Subtle Sustain: Contemporary Ethnic Identity and the Revitalization of the Lanna "Heart Harp"". Asian Music. 38 (2): 115–142. doi:10.1353/amu.2007.0035.

• The Traditional Music of Thailand By David Morton, Chen Duriyanga (Phra) p.91 has pictures of phin pia and phin namtao.
• Article on JSTOR, The Pia's Subtle Sustain: Contemporary Ethnic Identity and the Revitalization of the Lanna "Heart Harp," Andrew McGraw, Asian Music, Vol. 38, No. 2 (Summer - Autumn, 2007), pp. 115-142. [Subscription required]

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