purpose of commands

[Mark Stephen Mrotek]

Hello:

 

The attached snippet, commands.ly, is from

http://www.lilypond.org/doc/v2.16/Documentation/notation/multiple-voices.html.

 

1.       What is the purpose/effect of the first line?

2.       What is the purpose/effect of the command \bar "||" before voiceTwo?

 

Thank you.

 

Mark

commands.ly
Description: Text Data