Re: time signature 4 / \breve ?

[Graham King]

Another way (slightly different result):

\version "2.19.82"

{ 
  \once \override Staff.TimeSignature #'stencil =
    #(lambda (grob)
      (grob-interpret-markup
       grob
       #{ \markup
          \override #'(baseline-skip . 1) 
          \center-column {
            \musicglyph "four"
            \musicglyph "noteheads.sM1" } #}))
  \time 8/1
  c'\breve c' c' c'
}