Bismillahir Rahmaanir Raheem.

Fasting in Islam is a powerful spiritual discipline. Its primary objective is to train the faithful spiritually and morally. Therefore, in order for us to reap true benefits of fasting, we must not only abstain from food and drink and sexual relations from dawn to dusk but also must shun all activities and behavior that erode or weaken the spirit of fasting. Proper fasting involves guarding our eyes, ears, hands, feet, as well as our mind against sins.
The Prophet (peace be upon him) said: "Whoever does not shun foul words and acting accordingly, there is no need for him to deprive himself of food and drink." (Reported by Bukhari on the authority of Abu Hurayrah). He also said, "Fasting is a shield (against sins or vices); so if one of you is fasting, let him not engage in wrangling or foul or idle talks or deeds. If anyone scolds or ridicules him, let him not retaliate; rather he should simply say, I am fasting, I am fasting." (Reported by Muslim on the authority of Abu Huraryah).

Listening to music and watching movies while one is fasting may fall under the categories of either sins or idle deeds or behavior. According to Aishah ra, the beloved wife of the Prophet (peace be upon him), as well esteemed Imams such as Awzai and a number of scholars of the pious generations, activities such as backbiting, engaging in gossip, idle chats and activities will render one's fast null and void. Therefore, in their view, those who are guilty of such behavior must make up their fasts. Although the majority of scholars do not share the same view as far as breaking the fast is concerned, nevertheless, they also concur the fact that such activities do take away true rewards and blessings of fast. May Allah protect us from any evil deeds. Aameen.