Bar lines in lilypond

Question

I want to control on the locations of the bar lines (yellow marked). I want to move them to any other places when ever I would like to do. its seems to me that bar lines pop up automaticaly...

For example, see part of my code:

\relative {
  \key g \minor 
  \numericTimeSignature
  \time 4/4
  \fdo g'8 \ \bar "|"
  \fre d'4  \fre d4  \fsol g4, \fdo c4 \fdo c4 \fsol g4 \bar "|"
  \fsi b2.
}

Answer 1

As Kilian and Richard both say, you need to do two things:

1. Change the time signature to 6/4 (or 3/2)
2. Add a "partial" (because of the upbeat). This is an eighth note, so \partial 8

With these changes, Lilypond will automatically add bar lines in the correct places. You can add a "|" symbol to indicate that you think a bar line should go here (and Lilypond will check that it agrees).

Here's your example with these changes (omitting the fingering diagrams):

\version "2.22.1" % It should work with other versions too!
\language "english"

\relative {
  \key g \minor 
  \numericTimeSignature
  \time 6/4 % changed!
  \partial 8 % added!
  g'8 |
  d'4 d4 g,4 c4 c4 g4 |
  b2.
}

Result:

Answer 2

The bar lines pop up wherever the time signature tells them to. If you want them in the correct places, use the right \time signature for your piece, and don't forget to use \partial if you have an upbeat.

Answer 3

As Kilian says, you'll need to change the time signature whenever you do so.

However, you can suppress the display of the time signature by including \with { \omit TimeSignature } in your Staff. For example, the following snippet from the LilyPond Snippet Repository shows how this can be done:

\new Staff \with { \omit TimeSignature } {
  \relative c'' {
    \time 3/4
    c4 c c
    \time 2/4
    c4 c
    \time 3/4
    c4 c c
    \time 2/4
    c4 c
    \time 5/4
    c4 c c c c
    \time 2/4
    c4 c
  }
}