piano staff dynamics and template found in docs.

[Sterling Sympatico]

Hi,

I am using 2.6.3 now and am looking over the template for putting
dynamics in piano staff.  I am a little confused about some of the
blocks of info needed to do this.

I understand:

\upper =
\lower =
\dynamics =

\score {
        \context PianoStaff <<
                \context Staff=upper \upper
                \context Dynamis=dynamics \dynamics
                \context Staff=lower \lower
        >>
\layout {
}

but then there is another \score block that doesn't make sense to me.  I
guess I need some clarification as to what this second \score block is
for.

Thanks for any simple explanation so I can get my head around the format
of this coding.

Yours,

Sterling MacNay