Tente usar o XDG aberto, ele deve abrir o arquivo com o aplicativo padrão:
xdg-open music.mp3
De página de manual do xdg-open :
NAME
xdg-open - opens a file or URL in the user's preferred application
SINOPSE
xdg-open {file | URL} xdg-open {--help | --manual | --version}
DESCRIÇÃO
xdg-open opens a file or URL in the user's preferred application. If a URL is provided the URL will be opened in the user's preferred web browser. If a file is provided the file will be opened in the preferred application for files of that type. xdg-open supports file, ftp, http and https URLs. xdg-open is for use inside a desktop session only. It is not recommended to use xdg-open as root.