According to the religious teachings, there are two kinds of pleasant music in Heaven: One is the music of the nature of the Heaven, like the song of the Heavenly birds, the sound of rivers and waterfalls, and the sound of tree leaves while dancing in the breeze. And the second one is the special songs of the Heaven.
Imam Ali (A.S) said, "You would have turned away from everything in this world, if you knew what was awaiting you in the Heaven; the beauties in its nature and the sound of the leaves close to the rivers will astonish you."
Prophet Muhammad (PBUH) said, "Every year on the first day of Ramadhan, the leaves in the Heaven move with the breeze and make such a beautiful sound no one has ever heard."
Once a man asked Prophet Muhammad (PBUH) if there were winds in Heaven. "Yes, there are." He said, "Winds made of light. Whenever the people in Heaven wish to meet God, these winds blow on their faces and they become delighted and cheerful. Then the rivers flow, the trees sing, the birds cheer and everyone in the heavens can hear the cheerful song of the Heaven."
There is also mention of a tree with a beautiful music in Heaven. It is said that people, who deny the joy of impermissible music to themselves in this world, are rewarded with the music of this tree in the here world.
Prophet Muhammad (PBUH) said, "I swear that there is a tree in the Heaven, which worships God loudly. The voice of that tree is the most beautiful music ever."
Imam Reza (A.S) said, "God rewards people who keep away from the impermissible music in this world; He will command the wind to blow on a tree in Heaven. Then the tree makes the most beautiful music ever."
Imam Sadiq (A.S) said, "The music of Heaven contains the song of people and angels as well. When someone asked Prophet Muhammad (PBUH) if there was music in Heaven or not, he said that there was a river in Heaven with heavenly maidens sitting by it singing, "They sing in such a beautiful voice that no one has heard anything like it before."
There are not any verses in the Qur'an that directly talk about music in Heaven, but as God says in the Qur'an, "Now no person knows what delights of the eye are kept hidden (in reserve) for them - as a reward for their (good) deeds."
source : www.tebyan.net
