【镜中镜 (器乐)】
《镜中镜》（Spiegel im Spiegel），亦有译作《镜中之镜》，是爱沙尼亚作曲家帕特为小提琴与钢琴所写的器乐作品，写于1978年。
作品沿用帕特惯常的「钟鸣作曲法」方式创作的简约音乐，主乐器的旋律纯以上行或下行的自然音阶所构成，由最初两个音，最终变为接近两个八度的幅度；至于伴奏部份，则以不间断的分解和弦所组成，配以低音部或高音部的长音作为衬托。
全曲长度为10分钟。而除了原来的小提琴与钢琴的版本外，帕特亦改编予其他乐器的版本。现时，已出版了中提琴、大提琴、低音提琴、中音长笛、双簧管、英国管、单簧管、巴松管、圆号及Baritone Saxophone与钢琴的版本，亦有为管风琴的独奏版本。
2011年，本曲于BBC广播四台的节目「骚灵音乐」（Soul Music）中被重点介绍，小提琴家Tasmin Little表示《镜中镜》是一首充满「庞大的情感影响」的作品（with a powerful emotional impact）。
==乐曲分析==
本曲以F大调写成，采用 4 拍子，作曲家手稿标示的速度为 ♩≈120，而印刷版本则标示为♩≈100。全曲共126小节。当中钢琴伴奏主要以F大调主和弦的第二转位、以分解和弦的方式进行。而在最高音域及最低音域则以F音、A音或C音的延长音（同样采自F大调的主和弦）作为衬托。
至于小提琴部份，则全以附点全音符下拉奏上行或下行的音阶，其长度按每次增长，每一次结尾必停在长音A上：
\relative g'
{
\time 6/4
\key f \major
a1.~ a1.~ a2. r2.
}
前奏
三小节钢琴独奏
第一组
两个音，在长音A前各自加入一个音。上行为G音，下行为B♭ (音名)|Bflat音。
\relative g'
{
\time 6/4
\tempo 4 = 100
\key f \major
\override Voice.NoteHead.color = #(rgb-color 1 0 0)g1. \override Voice.NoteHead.color = #(rgb-color 0 0 0)a1.~ a1.~ a2. r2.
}
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 1 0 0)bes1. \override Voice.NoteHead.color = #(rgb-color 0 0 0)a1.~ a1.~ a2. r2.
}
第二组
三个音，在第一组的前方加入低一个或高一个音，上行为F音；下行为C音。（由此处起所有长音A不再标示）
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 1 0 0)f1. \override Voice.NoteHead.color = #(rgb-color 0 0 0)g1. a1.
}
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 1 0 0)c1. \override Voice.NoteHead.color = #(rgb-color 0 0 0)bes1. a1.
}
第三组
四个音，同样在第二组前加入高或低一个音，但排列方式上，除结束音外，改以倒转方向形式进行。
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 0 0 1 )g1. f1. \override Voice.NoteHead.color = #(rgb-color 1 0 1)e1. \override Voice.NoteHead.color = #(rgb-color 0 0 0)a1.
}
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 0 0 1)bes1. c1. \override Voice.NoteHead.color = #(rgb-color 1 0 1)d1. \override Voice.NoteHead.color = #(rgb-color 0 0 0)a1.
}
第四组
五个音，回复原来的次序和排列。
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 1 0 0)d1. \override Voice.NoteHead.color = #(rgb-color 0 0 0)e1. f1. g1. a1.
}
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 1 0 0)e'1. \override Voice.NoteHead.color = #(rgb-color 0 0 0)d1. c1. bes1. a1.
}
第五组
六个音，和第三组处理方法一样，除结束音外，次序倒转。
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 0 0 1 )g1. f1. e1. d1. \override Voice.NoteHead.color = #(rgb-color 1 0 1 )c1. \override Voice.NoteHead.color = #(rgb-color 0 0 0 )a'1.
}
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 0 0 1 )bes1. c1. d1. e1. \override Voice.NoteHead.color = #(rgb-color 1 0 1 )f1. \override Voice.NoteHead.color = #(rgb-color 0 0 0 )a,1.
}
第六组
七个音，回复原来的次序和排列。
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 1 0 0)bes,1. \override Voice.NoteHead.color = #(rgb-color 0 0 0)c1. d1. e1. f1. g1. a1.
}
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 1 0 0)g'1. \override Voice.NoteHead.color = #(rgb-color 0 0 0)f1. e1. d1. c1. bes1. a1.
}
第七组
八个音，和第三、五组的处理方法相同，除结束音外，次序倒转。刚好跨越一个八度。
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 0 0 1 )g1. f1. e1. d1. c1. bes1. \override Voice.NoteHead.color = #(rgb-color 1 0 1 )a1. \override Voice.NoteHead.color = #(rgb-color 0 0 0 )a'1.
}
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 0 0 1 )bes1. c1. d1. e1. f1. g1. \override Voice.NoteHead.color = #(rgb-color 1 0 1 )a1. \override Voice.NoteHead.color = #(rgb-color 0 0 0 )a,1.
}
第八组
九个音，回复原来的次序和排列。小提琴由最低音开始。
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 1 0 0)g,1. \override Voice.NoteHead.color = #(rgb-color 0 0 0)a1. bes1. c1. d1. e1. f1. g1. a1.
}
\relative g'
{
\time 6/4
\key f \major
\override Voice.NoteHead.color = #(rgb-color 1 0 0)bes'1. \override Voice.NoteHead.color = #(rgb-color 0 0 0)a1. g1. f1. e1. d1. c1. bes1. a1.
}
结束
最后再以一个长音A作完结。
==流行文化的应用==
《镜中镜》自面世至今，已被不少的电影及电视采用为配乐，其中主要包括了下列的作品：
===电影===
===舞蹈===
*David Nixon's Dracula performed by the Northern Ballet (UK, 2009)
*Pilobolus' Rushes in a scene choreographed using chairs. (US, 2007)
*Christopher Wheeldon's 2005 ballet After the Rain, part two (Pärt's "Tabula Rasa" is the score to part one)
*John Neumeier's ballet Othello (1985), the central pas de deux (Pärt's "Tabula Rasa" is the score to part two)
*Mats Ek's Smoke performed by Sylvie Guillem and Niklas Ek (1995)
*Stephen Mills' Desire performed by Ballet Austin (1998)
===剧院===
*The New York production of Eurydice, a play by Sarah Ruhl (2007)
*Venezuelan production called 120 vidas x minuto ("120 Lives a Minute"), a play by Gustavo Ott (2007)
*Czech production of Forgotten Light ("Zapomenuté světlo"), a play by Jakub Deml
*French production of The Glass Menagerie (Tennessee Williams) a play by Daniel Jeanneteau (2016)
*Canadian production of Othello, a play by William Shakespeare, directed by Ian Farthing at the St. Lawrence Shakespeare Festival (2012)
===电视===
* The BBC documentary Touched by Auschwitz (2015)
* The BBC documentary Auschwitz: The Nazis and 'The Final Solution'  (2005) (which also  used Fratres)
* The BBC drama Hattie (2011)
* The RTS and Colossal production documentary "Izgubljeni orden" (The Lost Medal) (2010)
* The BBC television series Criminal Justice (2009)
* The BBC medical drama Casualty (2008, 2010) and its spin-off show Holby City (2016, 2019)
* The season two episode of Supernatural, titled "What is and What Should Never Be" (2007)
* The BBC dramatisation of Elizabeth Gaskell's North and South (2004)
* The BBC documentary Century of the Self by Adam Curtis (2002)
* The BBC documentary John Steinbeck: Voice of America by Melvyn Bragg (2011)
* The FOX television show Simpsons episode 534 Yolo (2013)
* The RTÉ News, on New Year's Eve, at the end of news editions as a memorial to victims of road traffic deaths during the year
* The Carlton series The Wrong Side of the Rainbow (2001)
* The S4C television drama Gwaith/Cartref (2015).
* The BBC documentary The Secret Life of Chaos (2010) presented by Jim Al-Khalili
* The season four episode and series finale of The Good Place, titled "Whenever You're Ready" (2020)
* The BBC documentary series Modern Masters, uses it in the second episode about Henri Matisse. Presented by Alastair Sooke. (2010)
===体育===
*美国日裔花样滑冰兄妹组合亚历克斯·涩谷及马娅·涩谷曾于2016-2017年度赛季作为自选项目曲目。
*俄罗斯的花样滑冰选手卡米拉·瓦莉娃亦于2018-2019及2019-2020的两个赛季中选用了本曲的改编版本作为她短项目的自选曲。
===歌曲===
* 《镜中镜》：香港歌手姜涛于2022年1月推出的单曲，当中结尾部份使用了本曲的伴奏动机。