一切經音義 18.44

18.44

以頌（徐用反鄭略周禮云頌誦也容也考聲頌者歌盛德之詩羙其形容告于神明故謂之頌）。

With eulogistic verses (the pronunciation is [the fanqie] 徐 + 用. Zheng's summary of the Zhouli says: 'Song means to recite; it also means appearance.' The Kaosheng says: 'Song is poetry singing of abundant virtue, praising its outward appearance and reporting to the divine spirits; therefore it is called song').