"I saw before me a huge crowd which no one could count from every nation and race, people and tongue.... They cried out in a loud voice,

'Salvation is from our God, who is seated on the throne, and from the Lamb'"(Rv 7:9-10)

Heaven consists of Communion of Life. "The perfect life with the most Holy Trinity -- this communion of life and love with the Trinity, with the Virgin Mary, the angels and all the blessed - is called 'heaven'." (Catechism. of the Cath. Church, No. 1024)

Heaven is an eternal dimension which does not mean time without end. "Eternity is the simultaneous and complete possession of infinite life." (Boethius) "God's knowledge, which passes over every change and time, embracing infinite lengths of past and future, views in its own direct comprehension everything as though it was taking place in the present."(Boethius)

Unlike God, we live in the present, past and future are unable to grasp simultaneously the whole of a lifetime. When we die we pass into metahistory, a dimension of existence closer to the eternal, where the living past becomes present. Everything will be in the present . Awareness of time with all its dimension of frustration, boredom, etc. will be transfigured into a timeless dimension analogous to, but not the same, as to God's eternity.

Heaven will be the transformed Cosmos as St. Paul states: "Indeed the whole created world eagerly awaits the revelation of the sons of God. ... the world itself will be freed from its slavery to corruption and share in the glorious freedom of the children of God. (Rm 8:19,21)

Music is the primal language of Creation. Here we discover harmonic resonances as in the movements of the stars, the sound of the wind, the rhythm of sea waves, the growth of vegetation , songs of birds and the harmony of body and soul. Man senses and gives expression to these harmonic resonances in his search for the ultimate reality found in the love of God.

Now the harmonic resonances of the new creation (heaven) must be much greater than those of the present universe, and the music of the heavenly man ecstatic in the love and vision of God must engage the totality of his being in a manner unheard of on earth in the praise of God and the wonders of the new creation. "Holy, Holy, Holy, is the Lord God of hosts, all the earth is full of his glory. ( Is 5:16) After the resurrection of the body, music will also be expressed through the body primarily in song forming a human choirs praising God. In view of all this, I would not be surprise if the language man speaks in heaven turns out to be a musical language.

Will there be instrumental music in heaven? Yes and No.

I do not believe we will make music instruments in heaven because the human being harmonized as he is in body and soul will become an instrument of music, polyphany being an analogus type of the music.