How to transfer/load music from computer to iPhone/iPad/iPod (Bangla tutorial)

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This is a quick tutorial on how to transfer music from computer to iPhone 4, iPhone 4s, iPhone 5, iPhone 5s, iPhone 6, iPhone 6 plus, iPhone 6s, iPhone 6s Plus,iPhone 7,iPod,ipad or whatever iPhone that is compatible to iTunes version 12.5.5.5