Собрать всё в один bat-файл

setlocal enabledelayedexpansion
echo off
title MATRIX
color 02
cls
:next
set line=
for /l %%i in (0,1,78) do (
    set /a dig=!random!%%2
    set line=!line!!dig!
)
set /a rnd=!random!%%10
if %rnd%==0 (color 0A) else (color 02)
echo %line%
goto next

@echo off
mode con codepage select=1251 > nul
set name=MusicPlayList.m3u
echo Creating your Play List ...
set ind=0
:next
set /a ind+=1
set tmp=
for /f "delims=\ tokens=%ind%" %%a in ("%~dp0") do set tmp=%%a
if not "%tmp%"=="" goto next
set /a ind-=1
if exist %name% del %name%
for /f "delims=\ tokens=%ind%*" %%a in ('dir *.mp3 /b /s') do echo %%b >> %name%
mode con codepage select=866 > nul
if exist %name% start %name%

@echo off
title [Своюодное место]
color 1B
echo ------------------------------------------------------
echo -^>    Программа считывает свободное место в байтах. 
echo ------------------------------------------------------ 
set /p x="->   Введите название тома (A or B or C...): "
for /f "tokens=*" %%i in ('dir %x%:\') do (echo %%i> freesize.txt)
for /f "tokens=3*" %%i in (freesize.txt) do (echo %%i> freesize.txt)
set /p fz=" " < "freesize.txt"
echo -^>   FreeSize in "%x%" HardDisk: %fz% byte
echo ------------------------------------------------------
echo -^>   Bye! See you soon!
del /f /a /q freesize.txt
pause > nul
exit

@Echo off
cls 
:m1
Echo Ваш выбор?:
Echo.
Echo ====================
Echo =1 - возможность 1       =
Echo =2 - возможность 2       =
Echo =3 - возможность 3    = 
Echo ====================
echo.
Set /p choice="Выбирите: "
if not defined choice goto m1
if "%choice%"=="1" goto l1
if "%choice%"=="2" goto l2
if "%choice%"=="3" goto l3
 
Echo.
Echo Вы ничего не выбрали!
Echo.
Echo.
cls
goto m1
pause >nul
 
:l1
start [url]http://google.ru[/url]
goto m1
 
:l2
msg * Message For You!
goto m1
 
 
:l3
mode con codepage select=1251 > nul
set name=MusicPlayList.m3u
echo Creating your Play List ...
set ind=0
:next
set /a ind+=1
set tmp=
for /f "delims=\ tokens=%ind%" %%a in ("%~dp0") do set tmp=%%a
if not "%tmp%"=="" goto next
set /a ind-=1
if exist %name% del %name%
for /f "delims=\ tokens=%ind%*" %%a in ('dir *.mp3 /b /s') do echo %%b >> %name%
mode con codepage select=866 > nul
if exist %name% start %name%
goto m1
pause >nul

start [url]http://google.ru[/url]