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乐律一(5/5)

为阳吕,阳吕皆上生。六十律相反,所以分为一纪也。

今太常钟镈,皆于甬本为纽,谓之旋虫,侧垂之。皇祐中,杭州西湖侧,发地得一古钟,匾而短,其枚长几半寸,大略制度如《凫氏》所载,唯甬乃中空,甬半以上差小,所谓衡者。予细考其制,亦似有义。甬所以中空者,疑钟縻自其中垂下,当衡甬之间,以横括挂之,横括疑所谓旋虫也。今考其名,竹筩之筩,文从竹、从甬,则甬仅乎空;甬半以上微小者,所以碍横括,以其横括所在也,则有横之义也。其横括之形,似虫而可旋,疑所谓旋虫。以今之钟、镈校之,此衡甬中空,则犹小于甬者,乃欲碍横括,似有所因。彼衡、甬俱实,则衡小于甬,似无所因。又以其括之横于其中也,则宜有衡义。实甬直上植之,而谓之衡者何义?又横括以其可旋而有虫形,或可谓之旋虫;今钟则实其纽不动,何缘得“旋”名?若以侧垂之,其钟可以掉荡旋转,则钟常不定,击者安能常当其燧?此皆可疑,未知孰是。其钟今尚在钱塘,予群从家藏之。

海州士人李慎言,尝梦至一处水殿中,观宫女戏*5。山阳蔡绳为之传,叙其事甚详。有《抛[*5]曲》十余阕,词皆清丽。今独记两阕:“侍燕黄昏晓未休,玉阶夜色月如流。朝来自觉承恩醉,笑倩傍人认绣[*5]”“堪恨隋家几帝王,舞裀揉尽绣鸳鸯。如今重到抛[*5]处,不是金炉旧日香。” 《卢氏杂说》:“韩皋谓嵇康琴曲有《广陵散》者,以玉陵、母丘俭辈皆自广陵败散,言魏散亡自广陵始,故名其曲曰《广陵散》。”以余考之“散”自是曲名,如操、弄、掺、淡、序、引之类。故潘岳《笙赋》:“辍张女之哀弹,流广陵之名散。”又应琚《与刘孔才书》云:“听广陵之清散。”知“散”为曲名明矣。或者康借此名以谏讽时事“散”取曲名“广陵”乃其所命,相附为义耳。

马融《笛赋》云:“裁以当簻便易持。”李善注谓“簻,马策也。裁笛以当马簻,故便易持。”此谬说也。笛安可为马策?簻,管也。古人谓乐之管为簻。故潘岳《笙赋》云:“脩簻内辟,馀箫外逶。”裁以当簻者,余器多裁众簻以成音,此笛但裁一簻,五音皆具。当簻之工,不假繁猥,所以便而易持也。

笛有雅笛,有羌笛,其形制、所始,旧说皆不同。《周礼》:“笙师掌教箎篴。”或云:“汉武帝时,丘仲始作笛。”又云:“起于羌人。”后汉马融所赋长笛,空洞无底,剡其上孔五孔,一孔出其背,正似今之“尺八”李善为之注云:“七孔,长一尺四寸。”此乃今之横笛耳,太常鼓吹部中谓之“横吹”,非融之所赋者。融《赋》云:“易京君明音律,故本四孔加以一。君明知加孔后出,是谓商声五音毕。”沈约《宋书》亦云:“京房备其五音。”《周礼·笙师》注:“杜子春云:‘篴乃今时所吹五空竹篴。’”以融、约所记论之,则古篴不应有五孔,则子春之说,亦未为然。今《三礼图》画篴,亦横设而有五孔,又不知出何典据。

琴虽用桐,然须多年木性都尽,声始发越。予曾见唐初路氏琴,木皆枯朽,殆不胜指,而其声愈清。又常见越人陶道真畜一张越琴,传云古冢中败棺杉木也,声极劲挺。吴僧智和有一琴,瑟瑟微碧,纹石为轸,制度音韵皆臻妙。腹有李阳冰篆数十字,其略云:“南溟岛上得一木,加伽陀罗,纹如银屑,其坚如石,命工斲为此琴。”篆文甚古劲。琴材欲轻、松、脆、滑,谓之四善。木坚如石,可以制琴,亦所未谕也。《投荒录》云:“琼管多乌樠、呿陀,皆奇木。”疑“伽陀罗”即“呿陀”也。 高邮人桑景舒,性知音,听百物之声,悉能占其灾福,尤善乐律。旧传有《虞美人草》,闻人作《虞美人曲》,则枝叶皆动,他曲不然。景舒试之,诚如所传。乃详其曲声,曰:“皆吴音也。”他日取琴,试用吴音制一曲,对草鼓之,枝叶亦动,乃谓之《虞美人操》。其声调与《虞美人曲》全不相近,始末无一声相似者,而草辄应之,与《虞美人曲》无异者,律法同管也。其知者臻妙如此。景舒进士及第,终于州县官。今《虞美人操》盛行于江吴间,人亦莫知其如何为吴音。

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