I usually make a very much usage of mt itunes library , actually first I was having an ipod , but later on I switched to iphone , how ever I was not able to sync music , I will explain you the whole scenario in detail. I first load any music cd into my itunes library, then after that I connect my iphone to it , I ensure that sure music chosen that i wish to sync is chosen check iphone to notice if music was synced, but unfortunately that does no happen , please help me out in this issue which it is not , please help me out to sort this.
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