Set absolute vertical position of staff?

[wjm]

Greetings Ahley,
You wrote
+++++
I teach drum kit, and I've started using Lilypond to produce short 
examples of
various beats.  I'm attaching my first attempt: a single sheet, in PDF 
format. ..... snip
+++++

Perhaps the following might be of help?
Regards

Bill

-----------------------------------------------------
\version "2.15.30"

#(set-global-staff-size 45) %adjust to suit
\header
{
        tagline = " "
}

\paper {
  top-system-spacing #'basic-distance = #10 %adjust to suit
  score-system-spacing #'basic-distance = #15 %adjust to suit
  last-bottom-spacing #'basic-distance = #10
}
        
musicA = \relative c'
{ \drummode { \repeat unfold 4 { bd8 hh8 } } }
musicB = \relative c'
{ \drummode { \repeat unfold 4 { bd8 hh8 } } }
musicC = \relative c'
{ \drummode { \repeat unfold 4 { bd8 hh8 } } }

\score
{
    \new DrumStaff  { \musicA }
}

\score
{
    \new DrumStaff { \musicB }
}

\score
{
    \new DrumStaff { \musicC }
}