Since I bought the DLC. Let me share you the names of the new music from the text document.
21161781 Indonesia_Ancient_Lenker_Suling-Gamelan
53825082 Cambodia_Ancient_FolkSong_Slower
82334660 Indonesia_Ancient_RD_2ndHalf_Gamelan-Suling
105708777 Cambodia_Ancient_Theme_Faster_wDrumKhloy
116678054 Cambodia_Ancient_Flower
128315560 Cambodia_Ancient_PriPrhn
154741117 Khmer_Atomic
178626266 Indonesia_Ancient_RD_1stHalf_Suling-Gamelan
229777735 Cambodia_Ancient_Theme_Roneat_Slow
239190692 Cambodia_Ancient_Ceremonial_wDrum
281581670 Indonesia_Ancient_Theme-BapangSelisir
326166432 Indonesia_Ancient_UdanMas
334384642 Indonesia_Ancient_RD_2ndHalf_Reyong
339713842 Cambodia_Ancient_PestleDance
353522511 Indonesia_Medieval
386655005 Cambodia_Ancient_FolkSong_Faster
389124822 Indonesia_Ancient_Drum2
393830268 Khmer_Industrial
497335012 Cambodia_Ancient_Theme_Roneat_MediumTemp
573444213 Cambodia_Ancient_KolonKolkret_Slower
591616838 Inodonesia_Atomic
594797758 Cambodia_Ancient_LaoLik
597918541 Indonesia_Industrial
645637583 Cambodia_Ancient_ScarfDance_wDrum
723654851 Cambodia_Ancient_FlowerWorld
727195641 Cambodia_Ancient_CeremonialDrum
758970568 Cambodia_Ancient_KolonKolkret
797552315 Cambodia_Ancient_Theme_Roneat-Drums
837542322 Indonesia_Ancient_BapangSelisir_Faster
848015414 Cambodia_Ancient_ScarfDance_Khloy
903399640 Indonesia_Ancient_Drum1
964831621 Cambodia_Ancient_Theme_Khloy_Slower
992849626 Cambodia_Ancient_ScarfDance_Khloy_Faster
998493457 Khmer_Medieval