Music is what helps us to get through the day, and it helps us to express the feelings we can't. Sometimes, it has elements of humor that we can't find in other places.
Socially, music helps us to bond, and create feelings of solidarity and trust - which are really important in our society. examples would include singing in a choir, or playing in a band, and even singing a national anthem.
Spiritually, it is a form of worship, and music can also help us to draw nearer to God.
Therapeutically, there is also evidence that music can help us recover faster, and improve our mood (depression).
It's really really powerful! And is sometimes so inherent in all of us. =)