drumstick-vpiano: 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/drumstick-vpiano - from package: drumstick-tools

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

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