Image:Middle C in four clefs.png

This image shows the position of middle C when using treble, alto, tenor, and bass clefs, respectively. Created by bdesham using GNU LilyPond and released into the public domain. Here's the Lilypond code I used:

\version "2.3.25"

tune = \relative c' {
  \clef treble         c1
  \bar "" \clef alto   c
  \bar "" \clef tenor  c
  \bar "" \clef bass   c
}

\score {
  \new Staff {
    \override Staff.Clef #'full-size-change = ##t
    \tune
  }
  \layout {
    raggedright = ##t
    \context { \Score \override SpacingSpanner #'spacing-increment = #3.0 }
  }
}

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