LaTex and LP (undefined environment)

[Michael J Millett]

I am attempting to write a file in TexShop 1.43 that includes Lilypond 
code. But I keep getting the error message:

! LaTeX Error: Environment LilyPond  undefined.

Here are some things I've tried:

        Cut and pasted directly from the LP manual.
	Have tried spelling LP as LilyPond, lilypond, Lilypond, LilyPond.app, 
etc.
	Have used the entire path to the application, such as: 
/Users/michaelm/Desktop/LilyPondFolder/LilyPond.app.
	Made sure that the the TexShop file I was creating was in the the same 
folder as the Lilypond application.
        Have tried adding: \usepackage {lilypond}
        Have tried adding to the preamble: \newenvironment (lilypond).
        Have checked the archives.

I still get the same error message.
Any ideas what I'm doing wrong?

Here is an example from TexShop:

\documentclass[a4paper]{article}

\begin{document}

Documents for @command{lilypond-book} may freely mix music and text.
For example,

\begin{LilyPond }
\relative c' {
c2 g'2 \times 2/3 { f8 e d } c'2 g4
}
\end{lilypond}

Options are put in brackets.

\begin[fragment,quote,staffsize=26,verbatim] {lilypond}
c'4 f16

\end{lilypond}
        
\end {document}

I am hoping eventually to create tests and handouts using TexShop with 
Lilypond.

Thanks for your help.

Michael