Our respected teacher used to say that more than anything else, giving the ears to the sounds of music and songs, steal from men their will power and the power of resolution. Source: Forty Hadith | Imam Khomeini (R)

Try to be a man of strong will power and resolution, so that you may not go from this world as a person without resolution, and hence rise on the day of resurrection as a brainless-being, not in the form of human being. Source: Forty Hadith | Imam Khomeini (R)