Spacer Rests Global Confusion

[Reggie]

Hi list.

I am new to the LilyPond. I am trying to understand spacer rests and global
block. I know that you can use the global block to handle things like tempo
and time throughout a piece however regardless of what I try it always seems
to create an extra unnecessary staff. Of course I tried to combine my global
variable with my music variable using << >> but the staff still remains
added extra and all my music gets "erased" by the spacer rests. Such as <<
\global \music >>. Clearly I am doing something wrong. I have two questions
please.

1) Using Frescobaldi's template creation, it automatically separates out the
global block into the parts, not the staff. Do I need to delete these and
move the global to the score block in order to use correctly? Or how can I
add global to existing template code below? I am confused

2) What is the formula for determining the spacer rest? For example, when I
see s8*3, what does that mean? What does each number mean in sx*y?

Thank you for your advice. Here is Frescobaldi's default global block
handling. I can't get it to work << >>

\version "2.19.81"

global = {
  \key c \major
  \numericTimeSignature
  \time 4/4
  \tempo "Fast!"
  s1*4 \tempo "Largo" s1*3 \tempo "Allegro" 
}

cello = \relative c {
  \global
  % Music follows here.
  c d e f e d c d e f e d c d e f e d 
}

right = \relative c'' {
  \global
  % Music follows here.
  c1 d e f c d e f
  }

left = \relative c' {
  \global
  % Music follows here.
   c1 d e f c d e f
  }

celloPart = \new Staff \with {
  instrumentName = "Cello"
} { \clef bass \cello }

pianoPart = \new PianoStaff \with {
  instrumentName = "Piano"
} <<
  \new Staff = "right" \right
  \new Staff = "left" { \clef bass \left }
>>

\score {
  <<
    \celloPart
    \pianoPart
  >>
  \layout { }
}





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