Finish provreading appendix C

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-**C:** The Free Software Song {#c-the-free-software-song .unnumbered}
-=============================
-
-自由软件之歌
-=======
+## 自由软件之歌
 
 >  Copyright © 2010 Richard Stallman。理查德·斯托曼于1991年写出此歌词。
 
-The lyrics of “The Free Software Song” are sung to the melody of the
-Bulgarian folk song “Sadi moma bela loza.” To listen to a recording of
-the piece accompanied by Bulgarian instruments played in traditional
-style, please visit\
- <http://gnu.org/music/FreeSWSong.ogg>. @firstcopyingnotice{{This song
-is in a rhythm of 7/8; those unaccustomed to odd rhythms often take the
-unevenness to be a mistake. The meter can be analyzed into three
-subgroups as slow-quick-quick or 3-2-2. Such meters in Bulgarian music
-can often be stretched, and some musicians analyze this song as 3-2-3
-instead; however, the last “3” is not as long as the first. Yves Moreau,
-who collected and taught the dance, endorses the rhythm of 7.\
- @footnoterule @smallskip Copyright © 2010 Richard Stallman\
- {Richard Stallman wrote the lyrics above in 1991. This version of the
-score is published in @fsfsthreecite}\
-
 《自由软件之歌》取材自保加利亚民歌《Sadi moma bela loza》的旋律。可以到这里聆听由保加利亚乐器演奏的传统民歌版自由软件之歌<http://gnu.org/music/FreeSWSong.ogg>。
 
-这首歌是在7/8拍；这种不寻常的不均匀古怪节奏常常被看成是一种错误。该部分可拆分为三个单拍子，以慢—快—快或3—2—2拍子划分。保加利亚音乐的这样节奏，经常可以拉长，有些音乐家分析这首歌曲可以替代为3—2—3拍子；然而，最后的3拍并不如第一个3拍那么长。搜集并教授这种舞蹈的伊夫·莫罗，倾向于7拍节奏。
+这首歌是7/8拍的；这种不寻常的不均匀古怪节奏常常被看成是一种错误。该部分可拆分为三个单拍子，以慢—快—快或3—2—2拍子划分。保加利亚音乐的这种节奏，经常可以拉长，有些音乐家分析这首歌曲可以替代为3—2—3拍子；然而，最后的3拍并不如第一个3拍那么长。搜集并教授这种舞蹈的伊夫·莫罗，倾向于7拍节奏。
 
 ![song-book-jutta-scrunch-crop](song-book-jutta-scrunch-crop-zh.png)