《晋书·志·第六章》
至于说在殿堂上的飨宴，没有四厢的钟磬乐悬，由于笛有固定的音高，所以弦歌等皆以笛音为音高准则，因此说笛就像钟磬，当然必定与律吕相合。
至于飨宴殿堂之上，无厢悬钟磬，以笛有一定调，故诸弦歌皆从笛为正，是为笛犹钟磬，宜必合于律吕。
As for banquets in the palace halls, there was no chime-bell orchestra in the four-sided performance space, so because the flute had a fixed pitch, all the string and singing instruments used the pitch of the flute as their standard. Therefore, we could say that the flute is like the chime bells and must naturally be in accord with the pitch pipes.