In his journal, Hsu Tsang-houei wrote with great perception of his happy surprise at first hearing Difag and Igay: "During the afternoon we recorded mostly polyphonic free counterpoint music, and how they could improvise and sing--it was enough to make you want to jump for joy!
在當年的採集日記裡，許常惠以感性的語調，寫下他對初識里望及以蓋的驚喜。「今天下午，我們錄的大部份便屬於復音音樂的自由對位，他們竟能即興而唱，令人嘆為觀止。