I always hear how satan was a musician how is this supported by scripture?

Most who teach this take the description of the King of Tyrus in Ezekiel 28:12-15 [12] Son of man, take up a lamentation upon the king of Tyrus, and say unto him, Thus saith the Lord GOD; Thou sealest up the sum, full of wisdom, and perfect in beauty. [13] Thou hast been in Eden the garden of God; every precious stone was thy covering, the sardius, topaz, and the diamond, the beryl, the onyx, and the jasper, the sapphire, the emerald, and the carbuncle, and gold: the workmanship of thy tabrets and of thy pipes was prepared in thee in the day that thou wast created. [14] Thou art the anointed cherub that covereth; and I have set thee so: thou wast upon the holy mountain of God; thou hast walked up and down in the midst of the stones of fire. [15] Thou wast perfect in thy ways from the day that thou wast created, till iniquity was found in thee.
See All... to be a description of Satan. He is said there to have been in the Garden of Eden and was perfect in all his ways until iniquity was found in him. That fits none other but the devil. Therefore, the prince of Tyrus mentioned earlier in the chapter would be the earthly ruler of Tyre, while the king of Tyrus would be the devil who rules over the prince of Tyrus. Daniel, chapter ten, also deals with the connection between many earthly rulers and evil spiritual principalities.

Therefore, taking this to be Satan, Ezekiel 28:13Thou hast been in Eden the garden of God; every precious stone was thy covering, the sardius, topaz, and the diamond, the beryl, the onyx, and the jasper, the sapphire, the emerald, and the carbuncle, and gold: the workmanship of thy tabrets and of thy pipes was prepared in thee in the day that thou wast created.
See All... has a phrase that is very interesting: "the workmanship of thy tabrets and of thy pipes was prepared in thee in the day that thou wast created." That is, he was created with tabrets and pipes built in him. What would this refer to?  Tabrets (spelled taborets in modern English) are small drums like those used to beat out timing for a fife player. Pipes probably refer to tubes used to produce tones by blowing air through them, as in an organ. This shows us that the devil had the makings of percussion instruments and wind instruments built into his very being.

We can also arrive at a good conclusion as to why he had this apparatus built in him. In Ezekiel 28:14Thou art the anointed cherub that covereth; and I have set thee so: thou wast upon the holy mountain of God; thou hast walked up and down in the midst of the stones of fire.
See All..., he is called the "anointed cherub that covereth." In Ezekiel 10:1-22 [1] Then I looked, and, behold, in the firmament that was above the head of the cherubims there appeared over them as it were a sapphire stone, as the appearance of the likeness of a throne. [2] And he spake unto the man clothed with linen, and said, Go in between the wheels, even under the cherub, and fill thine hand with coals of fire from between the cherubims, and scatter them over the city. And he went in in my sight. [3] Now the cherubims stood on the right side of the house, when the man went in; and the cloud filled the inner court. [4] Then the glory of the LORD went up from the cherub, and stood over the threshold of the house; and the house was filled with the cloud, and the court was full of the brightness of the LORD's glory. [5] And the sound of the cherubims' wings was heard even to the outer court, as the voice of the Almighty God when he speaketh. [6] And it came to pass, that when he had commanded the man clothed with linen, saying, Take fire from between the wheels, from between the cherubims; then he went in, and stood beside the wheels. [7] And one cherub stretched forth his hand from between the cherubims unto the fire that was between the cherubims, and took thereof, and put it into the hands of him that was clothed with linen: who took it, and went out. [8] And there appeared in the cherubims the form of a man's hand under their wings. [9] And when I looked, behold the four wheels by the cherubims, one wheel by one cherub, and another wheel by another cherub: and the appearance of the wheels was as the colour of a beryl stone. [10] And as for their appearances, they four had one likeness, as if a wheel had been in the midst of a wheel. [11] When they went, they went upon their four sides; they turned not as they went, but to the place whither the head looked they followed it; they turned not as they went. [12] And their whole body, and their backs, and their hands, and their wings, and the wheels, were full of eyes round about, even the wheels that they four had. [13] As for the wheels, it was cried unto them in my hearing, O wheel. [14] And every one had four faces: the first face was the face of a cherub, and the second face was the face of a man, and the third the face of a lion, and the fourth the face of an eagle. [15] And the cherubims were lifted up. This is the living creature that I saw by the river of Chebar. [16] And when the cherubims went, the wheels went by them: and when the cherubims lifted up their wings to mount up from the earth, the same wheels also turned not from beside them. [17] When they stood, these stood; and when they were lifted up, these lifted up themselves also: for the spirit of the living creature was in them. [18] Then the glory of the LORD departed from off the threshold of the house, and stood over the cherubims. [19] And the cherubims lifted up their wings, and mounted up from the earth in my sight: when they went out, the wheels also were beside them, and every one stood at the door of the east gate of the LORD's house; and the glory of the God of Israel was over them above. [20] This is the living creature that I saw under the God of Israel by the river of Chebar; and I knew that they were the cherubims. [21] Every one had four faces apiece, and every one four wings; and the likeness of the hands of a man was under their wings. [22] And the likeness of their faces was the same faces which I saw by the river of Chebar, their appearances and themselves: they went every one straight forward.
See All..., there are four cherubim who stand at the four corners of the throne of God. Since "the glory of the LORD went up from the cherub" (Ezekiel 10:4Then the glory of the LORD went up from the cherub, and stood over the threshold of the house; and the house was filled with the cloud, and the court was full of the brightness of the LORD's glory.
See All...), the cherubim were there to give glory and praise to the Lord. But here we see no cherub covering the throne.  That had been the job of Satan as the anointed cherub that covered. He would be the fifth cherub and his job would have been to glorify God. It is interesting that the most powerful of God's heavenly creatures is the one who most prominently gives glory and praise to God. In one sense therefore, Satan was the heavenly choir director and he led the songs of praise to the Lord that still ring in heaven. The inbuilt tabrets and pipes would definitely come in handy here.

Now, when Satan fell in rebellion against God, he did not lose the natural abilities that God had given him. Therefore, he kept the tabrets and the pipes. But now, he did not use them to bring glory to the Lord but to turn God's creatures against their Creator. His expertise is seen in the powerful influence he welds today in music. He knows his music and he hates the Lord. This is a dangerous combination.