@echo off
if "%1" NEQ "$" (
for /f "tokens=1,2 delims=:" %%a in ('"%~0" $^|sort') do @echo %%b
) else for /f "delims=" %%i in ('dir /b /a-d *.mp3') do @call :sub %%i
goto :EOF
@echo off
setlocal EnableDelayedExpansion
for /f "delims=" %%i in ('dir/a-d/b *.mp3') do set $!random!!random!$%%i=$
for /f "tokens=1,2* delims=$=" %%i in ('set $') do echo %%j
pause