gnupod_addsong: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/gnupod_addsong - from package: gnupod-tools

You may install the required package with command apt-get install {package}
Error in other languages:
gnupod_addsong: bevel nie gevind nie
gnupod_addsong: comandă negăsită
gnupod_addsong: comando não encontrado
gnupod_addsong: commande introuvable
gnupod_addsong: command not found
gnupod_addsong: käsku ei ole
gnupod_addsong: không tìm thấy lệnh
gnupod_addsong: komanda nerasta
gnupod_addsong: Kommando nicht gefunden.
gnupod_addsong: kommandot finns inte
gnupod_addsong: komut yok
gnupod_addsong: nie znaleziono polecenia
gnupod_addsong: níor aimsíodh an t-ordú
gnupod_addsong: no se encontró la orden
gnupod_addsong: no s'ha trobat l'ordre
gnupod_addsong: opdracht niet gevonden
gnupod_addsong: parancs nem található
gnupod_addsong: perintah tidak ditemukan
gnupod_addsong: príkaz nenájdený
gnupod_addsong: příkaz nenalezen
gnupod_addsong: команда не найдена
gnupod_addsong: командата не е открита
gnupod_addsong: 命令找不到
gnupod_addsong: コマンドが見つかりません