This article discusses the musical concept of an orchestral piece entitled Andung Hu, which in Batak language means my lament. Andung Hu's work departs from the reinterpretation of the Andung tradition, a lamentation of sorrow in the context of the death committed by the Toba Batak people. Applying the method of transformation, with the concept of transit and transition, this paper is intended as a form of elaboration of the concept of Andung Hu's work. The data collected from the work process by Della Rosa Pangabean, which was analyzed critically-reflectively, by viewing the work process as a form of artistic research. The results of the analysis show that the transformation process from the Andung tradition in the Toba Batak society to the Andung Hu Orchestra takes three key stages, namely: interpretation; orchestration; and improvisation. The materials and tools used in the stages of the creation process are: scales; atonal technique; motive; development techniques; and taganing motifs. The result of the work is a composition in the form of a program music entitled Andung Hu.