Clef, Key, Meter

This example shows the use of \clef, \key and \meter tags.

{
    [   
        \pageFormat<lm=1cm, tm=1cm, bm=1cm, rm=1cm>
        \barFormat<"system"> 
        \clef<"violin"> \key<"D"> \meter<"4/4"> c f a g f# c#2 a1 b
    ],
    [
        \clef<"alto">  \key<2>   \meter<"C"> c c c c \acc(c#) c# c# c#
    ],
    [
        \clef<"tenor"> \key<-2>  \meter<"2+3+3/8"> c/8 b&0 a gf e& d c d e& f g a b c1 d
    ],
    [
        \clef<"bass">  \key<free="f[0.5]c">  \meter<"C/"> \alter<0.5>(c0/2 f g f)
    ]
}

Try it online