cdplay: command not found

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/cdplay - from package: cdtool

You may install the required package with command apt-get install {package}

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